autom.data update_Vendors w. Personnel number HR->FI

Normally I run Report RPRAPA00 on a regular Basis to maintain/ update vendor master data (for personnel).

Data is transferred from HR to FI, such as bank account data.

For some reason data for a number of vendors (with personnel number) and one and the same bank-key where assigned an empty field SWIFT/ BIC.

While Update in XK02 field BIC/SWIFT was empty.

This data also updated table BNKA as I could state in Transaction FI03.

Then the entry for this bank -key in BNKA showed an empty BIC/ SWIFT code field after updating XK02 (via RPRAPA00, Batch Input)

While updating another part of the vendors (with PERNR) in the same session, field BIC/SWIFTcode was  filled while updating.

BNKA did not appear updated.

Has someone also experienced this changes in vendor/ BNKA while automatical update?

And how Comes field for SWIFT/ BIC was empty?

Any hints will be appreciated.

raf