How to create a calculated field in Report Writer to print Extender fields in Microsoft Dynamics GP reports

This article describes how to create a calculated field in Report Writer in Microsoft Dynamics GP so that you can print Extender Window fields in Microsoft Dynamics GP reports. The calculated field that you create will use the rw_TableHeaderString user-defined function to print the Extender fields on the Microsoft Dynamics GP reports.

Applies to:   Microsoft Dynamics GP
Original KB number:   935385


Extender Detail Windows, Extender Forms, and Extender Detail Forms cannot be added to Report Writer reports.

In Report Writer, create a calculated field for the report that you want to modify. Use "string" as the result type. To add the rw_TableHeaderString function, follow these steps:

  1. Select the Functions tab.
  2. In the Functions list, select User-Defined.
  3. In the Core list, select System.
  4. In the Function list, select rw_TableHeaderString, and then select Add.

The rw_TableHeaderString function:

function returns string sData;

in integer dict_id;{Dictionary ID}
in string report_name;{Report Name}
in string sNumber;{control field}
in integer sType;{control field}
in integer iControl;{which piece of data to return}

This function returns a string value for the selected Extender Window field to the calculated field. Specify the following values for the rw_TableHeaderString function.

  • Parameter 1: 3107 for the Extender product

    This value is the dictionary ID of the third-party product. The third-party product should validate the dict_id parameter against its own dictionary ID. Then, the third-party product will close if the function does not correspond to this product

  • Parameter 2: The Extender Window ID

    This value is the name of the report from which this function was called. This parameter may not be used in all situations. The report name is passed to the function if it is required.


    This string value must be the same as the Extender ID value. Otherwise, the field will not print.

  • Parameter 3: The key that you use in the Extender window

This value is a string that is part of the control field.


If the Extender window uses multiple keys, we recommend that you create a separate calculated field to perform the following actions:

  • Convert any keys that are not already strings to strings.
  • Concatenate the values that are in the Extender key fields.
  • Parameter 4: 0 (zero) for the Extender product

    This value is an integer that represents the field type of the control field. The value is always 0 for the Extender product

  • Parameter 5: The field number of the Extender field that you want to print

    This value is an integer that is used to determine which piece of data to return.


    If you want the third Extender field to print, this value must be 3.

For more information about how to create an Extender calculated field, see How to modify the SOP Blank Order Form report from an Extender window

If you have to find the field type for parameter 4, follow these steps:

  1. In Microsoft Dynamics GP, select Tools, select Resource Descriptions, and then select Fields.

  2. In the Product list, select Microsoft Dynamics GP. In the Series list, select the series that you are using.

  3. Select the field that you must have for the Extender key, and then select the Field Info button.

  4. In the Control Type column, select the field type that you want to use.

    For example, the value for the Line Item Sequence field in the Sales series is a long integer. Therefore, you must use the LNG_STR function to convert this field to a string.

The new calculated field must not contain extra spaces. Use the STRIP function in the calculated field to remove any extra spaces. Use the CAT operator to concatenate the values that are in the fields.

To see what the output should be, view the PT_UD_Key column in the EXT00100 table. The EXT00100 table shows the values of the Extender key fields concatenated in alphabetical order.