Partner &1, contract &2 is blocked for posting due to blocking reason &3

What causes this issue?

A posting block with blocking reason &v3& has been entered in the
master data of the contract.

System Response

You cannot post the requested document.

How to fix this error?

Check the master data of the contract.
If the posting block is no longer justified, deactivate it.

Error message extract from SAP system. Copyright SAP SE.