Look at you planning on those items on the item master. I know in 4c4 (and we use A&D) that we set the max build qty to 1 on some items. See if something like that is set. I know our 4c4 system we can plan for multiple quantities and get 1 planned production order. I also know if I have 2 planned orders I can release 1 for the right quantity and cancel the other. This is assuming I understand what you are asking.
My latest mantra - make sure you have latest stpapi patches and the latest session object. If on LN then please explore the option of using DAL2 functionality.
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