MDG-F USMD_DATA_TRANSFER_BACKEND custom fields

Hi Experts,

I'm trying to execute a background mass update of profit center data using program USMD_DATA_TRANSFER_BACKEND  for custom fields built. When testing the variant and file with File Import option, the file is read correctly and the CR is created.

But when I try to create in background with USMD_DATA_TRANSFER, the program issues errors for the custom fields:

Field & of transfer structure is unknown

Field & of transfer structure is unknown etc. etc.

Note 1864796 has already been implemented in our system - co-deployed MDG 7.2.  Any ideas why the background transfer would issue these errors? We need to use this as performance is terrible on standard File Upload.

Also, has anyone used DIF for mass updating active data in MDGF?

Thanks so much,

Tarynn