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@seungjae lee here is the catch, it appears that MS Team has added a deprecation in the BDC Service (This is extracted from Decompiled Microsoft.SharePoint.dll)
In SharePoint 2019, after applying KB5002639 and subsequent updates, deploying BCS solutions is not possible.
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(156.8, 49%, 25%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3ESL%3C/text%3E%3C/svg%3E)
seungjae lee
25
Reputation points
In SharePoint 2019, after applying KB 5002639 and subsequent updates, deploying BCS solutions is not possible.
Error messages is
DotNetAssembly/WebService system type is not supported.
Error was encountered at or just before Line: '4' and Position: '6'.
Error log: BCS_Deploy_Error.txt
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Microsoft 365 and Office | SharePoint Server | Development
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seungjae lee 25 Reputation points
2024-12-30T09:11:23.39+00:00 add error log: BCS_Deploy_Error.txt
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![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(160, 17%, 25%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EYJ%3C/text%3E%3C/svg%3E)
Yanli Jiang - MSFT 31,611 Reputation points Microsoft External Staff2024-12-30T09:50:09.0966667+00:00 Do you mean you have installed the latest updates KB 5002657and KB 5002664?
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seungjae lee 25 Reputation points
2024-12-31T00:24:45.6433333+00:00 Yes, my sharepoint farm installed KB 5002657and KB 5002664 . However, the same error occurs.
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![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(38.4, 53%, 13%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EMF%3C/text%3E%3C/svg%3E)
Mehdi Feghouli 80 Reputation points2025-01-10T17:55:09.18+00:00 @seungjae lee here is the catch, it appears that MS Team has added a deprecation in the BDC Service (This is extracted from Decompiled Microsoft.SharePoint.dll
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![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(9.6, 47%, 10%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3ETS%3C/text%3E%3C/svg%3E)
Thomas Stessl 61 Reputation points2025-03-29T13:34:39.4533333+00:00 Same for SP2016
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Accepted answer
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Mehdi Feghouli 80 Reputation points
2025-01-10T17:56:46.21+00:00 -
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(236.8, 90%, 32%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EMK%3C/text%3E%3C/svg%3E)
Michael Koger 5 Reputation points2025-01-10T18:28:39.58+00:00 We are also running into the same issue for several BDC models that we maintain. I don't see any mention of the BCS being deprecated for SharePoint 2016/2019, although it was deprecated in SharePoint Online in September (which is when this patch was released). Is this an issue that they introduced by mistake when deprecating it for SharePoint Online?
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Mehdi Feghouli 80 Reputation points
2025-01-10T19:19:27.13+00:00 It has to be escalated to Microsoft to see what's happening.
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Mehdi Feghouli 80 Reputation points
2025-01-10T20:32:53.5266667+00:00 we have to follow up.
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Michael Koger 5 Reputation points
2025-01-13T15:16:09.7833333+00:00 How do we escalate the issue to Microsoft?
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Yanli Jiang - MSFT 31,611 Reputation points Microsoft External Staff
2025-01-14T01:57:57.4033333+00:00 Hi @Michael Koger, Please refer to this: Global customer service phone numbers.
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1 additional answer
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Yanli Jiang - MSFT 31,611 Reputation points Microsoft External Staff
2024-12-31T06:44:23.92+00:00 Hi @seungjae lee ,
Welcome to Q&A forum!
I have done a lot of research, but there is not much reference material for your situation. Based on the information you provided, it can be determined that it is caused by an update, but the recent updates do not specify the impact on BCS. You can check if there are any Windows updates that have not been installed, which sometimes has an impact. If it doesn't work, you can try to roll back the update or wait for the next update to see if it can solve the problem. However, the forum engineer has limited authority. If you need to roll back the update, you need to escalate the issue. You need to contact Microsoft directly to operate. The support team over there has the correct escalation channels, and they can devote more resources and investigate the behavior from the backend as quickly as possible. They can also remotely check the behavior on your side. They can even help you find the root cause of the issue. For reference: Global customer service phone numbers. This is the most efficient way to handle this thread given the circumstances. I'm confident that our expert engineers over there can resolve this issue efficiently and accurately.
Good day! Happy New Year to you in advance!
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seungjae lee 25 Reputation points
2025-01-06T00:56:54.6666667+00:00 I understand there is no dedicated personnel for testing SharePoint 2019 BCS. This is disappointing.
This is a simple test.
Install SharePoint 2019 and applying patches, and then create and deploy a BDC Solution in Visual Studio.BDC Solution deployed but I cannot find deployed BDC.
So I manually upload the bdcm file, a 'DotNetAssembly/WebService system type is not supported.' error occurs.
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Yanli Jiang - MSFT 31,611 Reputation points Microsoft External Staff
2025-01-07T02:37:24.5466667+00:00 Hi @seungjae lee ,
Sorry to hear that you're having this problem, but the forum can only do so much for this issue. I still recommend that you contact Microsoft directly for a better solution.
If the answer is helpful, please click "Accept Answer" and kindly upvote it.
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