I think there is a little confusion about change pointers and change documents. Change documents are written every time when a field of a DDIC table is modified, if and only if the underlying data element has the field LOGFLAG (in DDIC: DD04D-LOGFLAG) is ticked. You can inspect this by browsing table DD04D or via transaction SE11 for the data element in question.
The ALE model ignores the CDHDR/CDPOS entries. Rather it uses an own definition of what has to recorded and used as change pointer trigger. These information is defined in tables:
* TBDA1 ? general activation
* TBDA2 ? message types relavent for change pointers
* TBD62 ? relevant fields for change pointers
The logic for this is coded in function:
Which is in turn called by:
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