The S.W.I.F.T. code has not been maintained for sender bank &1 &2

What causes this issue?

The <GL:SWIFT_code>SWIFT code</> of the <DS:DE.FORDSBNK>sender bank</>
of the MT101 file has not been maintained (bank country &V1&, bank key
&V2&, paying company code &V3&, house bank ID &V4&). If this
information is not added at a later date by the bank sending the MT101
file, the DME file is invalid.

How to fix this error?

You must carry out one of the following activities:
Enter the SWIFT code of the sender bank on the selection screen of the
program.
If the bank sending the MT101 file is also the bank receiving the file,
enter the SWIFT code of one of the receiving banks which is not the
house bank in the <DS:DE.DTELZ>Bank number of the bank receiving the
data medium</> field in the DME data for the house bank.
<DS:TRAN.FI12>Proceed</>
Maintain the SWIFT code of the house bank if the house bank is both the
receiving bank and the sender bank of the MT101 file.
<DS:TRAN.FI02>Proceed</>

Error message extract from SAP system. Copyright SAP SE.