BAQ - Calculation field results are blank

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Creating a BAQ in Vantage 8.03.400 and trying to reference a
calculation field in a calculation. Below, PartEndStr is referencing
the PartEndInt calculation. When displayed, PartEndInt displays the
value of 10 but the PartEndStr is blank. If I place a 10 in place of
the PartEndInt reference, I get the expected results. Any Ideas?

Thanks in advance,

Matt

Field name: PartEndInt
Expression: Length(Part.PartNum) - 4
Format:
Data type: Integer


Field name: PartEndStr
Expression: SUBSTRING(Part.PartNum, PartEndInt)
Format:
Data type: Character