I have a retargeted test case (so, the edif actually consists of RAMB16_s1_s18). RAMB16 gets retargeted to RAMB16BWER, but they are not included in the RAMS group.
The following error occurs:
"Checking Constraint Associations...
ERROR:ConstraintSystem:58 - Constraint <TIMESPEC "TSfromto" = FROM "PADS" TO
"RAMS" 20 ns;> [ramb16_s1_s18.ucf(5)]: RAMS "*" does not match any design
This issue will be fixed in 10.1 Service Pack 1.