Block double entry of item line

Hi,

Am still new in navision development I want to block a user from entering two same item number  in the sales line this is because the user  can inserts different quantities in the two lines in the same order number  and two same item numbers want to have only one item number in the sales line not repeating the items number in the lines.Am using navision 2015.

Regards,

oleluapo

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