I am not sure if you can "hide" a location in the way you are specifying, 
with vanilla MAPICS.  The only thing that is conceptually "similar" to 
what you are stating is the "non-netting locations".
At least in Release 6, MAPICS provides a non-netting feature that allows 
one to mark stocking locations that MRP will ignore during planning - 
essentially it hides inventory from MRP.  The flag is maintained on the 
location detail record at IM, 7, 9, 3 Location Detail (see Screen 1). Set 
Location Type to 1 to exclude from MRP. 
From within MRP's Item Requirements Inquiry, one can see the total, and 
non-Netting, on hand by pressing F21=Item Detail (see Screen 2), and roll 
to page 3 (see Screen 3).   In the example below, there are 76 total on 
hand, 32 non-netting, so MRP will only see 44 available.
(Note: you cannot do this to "QC" locations.)
My $0.02 cents...
PETER VIDAL 
MAPICS IT TECHNICAL SUPPORT TEAM / SR SYSTEM ANALYST 
10540 Ridge Rd., Suite 203, New Port Richey, FL 34654-5111
Tel:727-849-9999, x2414 /// Fax:727-815-3120
WWW.PALL.COM 
"Four eyes see better than two."
Anonymous
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