I have the following function that is supposed to set (update or add) a custom property in a document manager file

vbadocument manager 

Function setCustomProp(swDmDoc As SwDMDocument29, customPropNameStr As String, customPropValueStr As String, Optional SwDmCustomInfoType_e As SwDmCustomInfoType) 'if there's no type included we assume it's text If IsMissing(SwDmCustomInfoType_e) = True Then SwDmCustomInfoType_e