Program FDM_COLL_SEND01 create log message table BALHDR(header), BALDAT(item) and unfortunately, BALDAT has only 6 digit serial number field and that's the reason of error at message number 999999.
(Object : FIDM, SubObject : FIDM_SEND)
Program FDM_COLL_SEND01 create log message if only there's error or important notification and then number of log over 999999 is not normal.
These are log message samples
Update Run: Periodic Data Transfer
Company code C*** was processed
Only direct payers will be considered in company code C***
No business partner determined for customer **********
You may have no business partner or other various errors and you have to inspect a reason of huge error messages with more selection options for example company code.
Note 1654275 add program company code options and you can run FDM_COLL_SEND01 with company code even if Initial data transfer to reduce error messages and to inspect messages.