BTE Process 00001130 not triggered my MIRO

Hello,

After we patched our EHP3 system to the last support package (~01/2019) it seems triggering BTE 00001130 (POST DOCUMENT: SAP-internal field substitution) is not working any more. I know this topic was discussed many times, but I could not find any explanation.

This is what I observed:

00001120 - works fine, and can be used instead.

00001130 - entry (our Y-program) in BF41 was deleted during the patch. Other Y* Z* entries remain!!!???

00001130 is not triggered any more even the build in module - FMPDOC_PAYMENT_BLOCK_1130, set in BF41

SAP Note 1727349 - Business Transaction Event 00001130 does not run - also seems irrelevant

My only explanation is - it was deprecated, but I cannot find any official claim for that!

In the documentation it is said "This interface is only used internally by SAP"....

Can anyone explain this?