Download subroutine XML
Users with the 'Assembly Developer' permission can download a subroutine’s XML definition by right-clicking it in the catalog. The XML file helps identify and debug field mapping errors in subroutines.
Accounts having the "Assembly Developer" permission can download a subroutine's XML definition by right-clicking on a subroutine and choosing this menu option:

The subroutine XML can be useful for finding field mapping errors.