Hello Tammy & All,
Just to update here, after installing early SP3 my issue seems to be fixed , I can see the calls for formulaes which were supposed to get fixed in 2.1 SP2 is actually fixed in SP3
I can see them in logs too :
2015-11-23 10:54:27,300|DEBUG|Trace.AoPlugin|?.?|VSTA_Main|Skip call of CacheNewFormulaStrings for Worksheet Names, not an AO or Neutral sheet#
2015-11-23 10:54:27,300|DEBUG|Trace.AoPlugin|?.?|VSTA_Main|Skip call of CacheNewFormulaStrings for MacroParameters, not an AO or Neutral sheet#
2015-11-23 10:54:27,300|DEBUG|Trace.AoPlugin|?.?|VSTA_Main|Skip call of CacheNewFormulaStrings for Update Model, not an AO or Neutral sheet#
Thank you again Tammy
Piyush