Error when loading external payment file for MT940DE

Hi :)

When loading MT940DE file it gives the error “A Payer/Payee Identity does not exist. A parked payment will be created using company '10'.”

The loaded file is as follows

:20:310515         

:25:4021003006371023                 

:28C:0135/001

:60F:C230515USD1504358650,31 

:61:2305150515D15688,67NTRF12489                 

:86:DEBIT TRANSACTION NFR/23/004974884 BREF 25171 CREF 12489 BEN

C100100044120

:62F:C230515USD1878468612,09

I need to identify which characters in the above file stand in for the Payer/Payee Identity and the invoice number. If the invoice number is not available in the above file how can we add that to the external file

Thank you