LSMW Object reading, but not writing data.

Dear All:

I am developing an LSMW Object for Vendor Master Data, using Standard Batch/Direct Input for Object '0040' and Method '0001' (thus, program 'RFBIKR00').

I created identical source structures to create one on one relationships.

Then, I created one file per source structure to create the assignments. Every file has its own file name headings, matching those in the structure. Not all files contain data, but still I leave the file name headings in them.

The problem is, when I run the object, it uploads all files, reads all records but only one is actually written (from the first structure BGR00_SRC):

Thank you for your kind attention.

Guillermo.