Paymt guarantee categ. & requires specific. of financ.doc.categ. and type

What causes this issue?

While maintaining the form of payment guarantee, you created a form of
payment guarantee from the payment guarantee category &V1&, but you did
not specify either the

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

Financial document category or
Financial document type or
Both
The payment guarantee category &V1& requires a financial document. For
this reason, the above specifications are necessary.

System Response

The system does not allow this entry.

How to fix this error?

Complete your specifications.

Error message extract from SAP system. Copyright SAP SE.