Hi I have the following formula:

=IF(OR(INDEX(Sheet1!C:C,MATCH(B7,Sheet1!A:A,0))="" ),"YES",IF(INDEX(Sheet1!T:T,MATCH(B7,Sheet1!A:A,0) ,1)={"ATA115115","BBDD101101"},"YES","NO"))

It works fine until Sheet1!T:T,MATCH(B7 where it finds "BBDD101101" part
where I need it to input "YES" I only get a "NO"

If I delete the BBDD101101" part then the formula works fine, so has anyone
got any idea's to what I am doing wrong? How do I get the BBDD101101 to
return a "YES"?

Any help would be very much appreciated.

Bob