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How do i add stock to my inventory? Sam4 ?

I am trying to add items to create an inventory.

1.turn the key to P
2. press 250 subtl
3.scan item - it comes up
4.press how many i.e. 20
5.press x/time

message "warning stock error" appears every time....please help.
The Caribbean Spot, May 2016
RTFM

http://www.cashregisterhelp.com/SAM4s/SAM4smanuals.html

XXX, May 2016