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                 Gets the field handle for a given field name                 
function PXFldHandle
   (TblHandle        : TableHandle;       { table to get field number from }
    FldName          : String;            { name of field in table         }
    var FldHandle    : FieldHandle): Int; { returns field number           }
Errors: PXERR_INVFIELDNAME       74  Invalid field name
        PXERR_INVTABLEHANDLE     76  Invalid table handle | 
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