Call type for JIT customer &1 is not maintained

What causes this issue?

The call type must have been entered at the JIT customer.

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?

In the <DS:TRAN.JITV>JIT basic data</> enter the call type, which you
use for supplying the corresponding JIT customer.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.