Nested WITHs

Do not nest WITHs that reference different types of objects. Bad code

WITH PostedWhseShptLine DO BEGIN
...
WITH ItemLedgEntry DO
InsertBufferRec(...,"Serial No.","Lot No.",...);
...
END;

Good code

WITH PostedWhseShptLine DO BEGIN
...
InsertBufferRec(...,ItemLedgEntry."Serial No.",ItemLedgEntry."Lot No.",...);
...
END;