how to delete an inteam (plu)?

No, don't delete the whole file! The system is not really designed to have PLUs deleted, you just put your new products over the old ones. I think there is a way to inhibit a PLU if you don't want anyone to use it. The difference is with scanning PLUs. I am assuming you are not using a scanner. Are you using PLUs on the keyboard only?

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If anyone needs more information, the Sam4s / Samsung ER-650 manual is here:

http://the-checkout-tech.com/manuals/cashregisters/Samsung_ER-650_and_ER-650R_operating_programming_manual.html

Registerman
August 2012