I have Sale Slip Header(Custom Entity) where user can print Sale Slip(Word Template) and Sale Slip Header consist multiple Sale slip Lines but the requirement is that every Sale Slip Line must have Serial Number. For Example I have purchased 3 items and all 3 items details present in Sale Slip Line, Now each item serial number(1,2 or 3) should be generated so that Multiple sale slip line Item can identify in Printed Sale Slip.
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