This module is not declared as a CIF interface module

What causes this issue?

In the database table CIFOBJINFO the names of the interface modules
('SEND Modules') are specified for the transfer to APO, amongst other
things. In the current case, an entry was not found for the function
module &V1&. This can mean that the function module chosen is not an
interface module and as a result does not write an application log.
Choosing this module does not therefore make sense. In exceptional
cases (for example, special development) it may make sense to specify a
CIF application log configuration for the module &V1&.

System Response

The configuration is saved, but it will probably have no effect.

How to fix this error?

Check whether the function module selected is a CIF interface module.

Error message extract from SAP system. Copyright SAP SE.