Rule & has the contract start or end date as its baseline date

What causes this issue?

The system tried to determine the contract start date according to the
rule and found that the contract start date has been defined as the
baseline date. This is not allowed.

System Response

The system does not permit any further processing until the contract
start rule is maintained with a valid value.

How to fix this error?

DEFINE &FELDNAME& = 'Contract start rule'
INCLUDE 'NA_POSSIBLE_ENTRY' OBJECT DOKU ID TX LANGUAGE E
When choosing a value, please be careful that it is not based on the
baseline date.
If you cannot find a rule that suits your needs, fill in the contract
start date manually.
If you must use a rule for indirect date determination, you can create
the necessary rule in Customizing. If you do not have the authorization
to do so, contact your system administrator.
IF &DEVICE& = 'SCREEN'
<ds:TRAN.VOVL>Proceed</>
ENDIF

Error message extract from SAP system. Copyright SAP SE.