Item & contains commitment item with financial transaction other than 30

What causes this issue?

Item &V1& contains a commitment item with <DS:GLOS.Financial
transaction </>Financial transaction</> unequal to 30 (Post revenue,
expenses, assets). In Funds Management (and in the Cash Management
project) only postings containing the transaction 30 are updated.

System Response

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

How to fix this error?

Check your entry and enter a commitment item with financial transaction
30.

Error message extract from SAP system. Copyright SAP SE.