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Arghhh! One of the reasons I use REXX more often than not, when there are any string manipulations to perform.
Indeed, the *TCAT is not an implicit STRIP for both variables. The *TCAT is /Trailing/ strip on the first value only. Thus the concatenation will require a substring of the remainder of the non-zero digits string. That also means the character replacement of blank for zero is not even of interest, so only the &POS need be calculated. Thus after the subroutine call in what I offered, something like the following:
chgvar &sfxlen (&maxlen - &pos + 1)
chgvar &file (%sst(&file 1 4) *tcat %sst(&sfx &pos &sfxlen))

Regards, Chuck

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