# Back annotating SDF - Sum of two annotated limits are less than zero

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#### dw_man

##### Junior Member level 3
I got this warning when back annotating an sdf file. What exactly does it mean and will it cause any problems?

ncelab: *W,SDFNL2 (,35120|7): The sum of the two annotated limits to $setuphold,$recovery or \$recrem timing checks are less than zero for instance :UUTreg[6] , setting negative limit(s) to 0 <...sdf, line 17994>.

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