Choose processing type 1 or 2

What causes this issue?

You can only use processing type 1 or 2 to generate the direct posting
function modules.
Meaning:
1 = Update with immediate start
2 = Update with delayed start

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?

Error message extract from SAP system. Copyright SAP SE.