Since WX treats screen controls as strings (including columns of a table)

Trace(NumToString(COL_HstInvHdrSysId,"012d"))

does not work. You don’t get an error, it just doesn’t do anything because it’s not a number. So if COL_HstInvHdrSysId contains 123456 the result will be 123456.

instead you have to do:

nHstInvHdrSysId is int = COL_HstInvHdrSysId
Trace(NumToString(nHstInvHdrSysId,"012d"))

Now you will get expected result of 000000123456

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