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At least the MCH1201 "scalar data cannot be changed" describes your problem
when the source is MI. Unfortunately the C function 'cvthc' throws a red
herring MCH3601 "pointer not set for location referenced" when the source
operand is not good hex. For example:
H dftactgrp( *no ) bnddir( 'QC2LE' )
D CVTCH PR extproc( 'cvtch' )
D Target * value
D Source * value
D Length 10U 0 value
D Target S 3A
D Source S 6A inz( 'AB#012' )
/free
CVTCH( %addr( Target ) : %addr( Source ) : 6 );
*INLR = *on;
/end-free
Instead of some SENSIBLE message like "invalid hex character", this code
fails with MCH3601 "pointer not set for location referenced" .
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