Thank you for reaching out with your issue.
The first error you mentioned seems to be related to a null value in the data being migrated. It appears that the pipeline is trying to deserialize a null value into a non-nullable data type, which is causing the error. To fix this, you can try modifying the source query to exclude any rows with null values in the columns being migrated. Alternatively, you can modify the target table to allow null values in the columns being migrated.
Regarding the error code 9518, it seems to be related to the integration runtime being busy. To fix this, you can try waiting for some time and then retrying the operation later. You can also try increasing the number of integration runtime nodes or scaling up the integration runtime to handle more concurrent operations.
If the issue persists, please provide more details about your pipeline and the data being migrated, including the source and target data types, and any transformations being applied in the pipeline. This will help me provide more specific guidance on how to resolve the issues.
I hope this helps. Let me know if you have any further questions or concerns.