Scale/condition basis or income for condition record not known

What causes this issue?

The income for the condition record is not known or cannot be
determined by the program.
As a rule, this is due to an error having occurred in the determination
of the scale and condition basis or the income in a preceding workstep
(e.g. settlement accounting).

System Response

Since the scale and condition basis and the income must be known before
the function you requested can be performed, this function is not
possible.

How to fix this error?

Please rectify the error and perform the function again.

Error message extract from SAP system. Copyright SAP SE.