st: value label __MERGE for _merge already exists

[sara borelli <saraborelli77@yahoo.it>]

Dear Statalister
when I merge two datasets using mmerge I get the following mmessage

value label __MERGE for _merge already exists

the merge seems to work ok, but the obs from different datasets instead of getting labeled in the traditional way  like 
 obs only in master data                (code==1)          
 obs only in using data                 (code==2)
 obs both in master and using data      (code==3)

have just  obs  1          (code==1)  
           obs 2           (code==2)
           obs 3           (code==3)

This is happening only with some datasets, but I do not know exactly why.
is there a way to eliminate this new label of merge?





      

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