Message SAP 3E069 - Invalid remittance end date

Diagnosis
You entered an invalid remittance end date. The remittance end datemust be the 15th or last day of the month.

System Response
The system cannot create the remittance certificate.

Procedure
Change the remittance end date.
For example, in April 1999 the remittance end date can be:
15.04.1999
30.04.1999