Thanks very much!
- did not think of checking OSS.
For anyone else following this up here's the detail:
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Which parameter IDs can be used when you make an entry in the Segment text field (BSEG-SGTXT) and result in a replacement with the correct value?
Solution
$BLD - document date
$BUD - posting date
$ZFB - baseline date for payment
$BUP - posting period
$XBL - reference document number
No other fields are possible in the standard system, see routine
SEGMENTTEXT_SETZEN in program SAPFF001.
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Shame there are not more that can be used without programming (had hoped the variables could equal PID's or such).