Problem with declaration for &1; required entry field not filled

What causes this issue?

SET DATE MASK = 'DD.MMMM.YYYY'
The declaration for &V1& creates a problem because a required entry
field for the data medium exchange with the dual system is not filled.
The specification &V4& is missing for the recycling partner &V3& in the
company code &V2&.

System Response

The declaration is terminated.

How to fix this error?

Maintain the following data in recycling partner maintenance: &V4&.

Error message extract from SAP system. Copyright SAP SE.