Thisis the code that I was using. Note:ISBLANK. IF(ISBLANK(R121"",IF(U121=0,"",MOD(R121-I121,1)))
I changed it toIF(R121<>"",IF(U121=0,"",MOD(R121-I121,1)))
And now I get"FALSE" in cells that are not used yet.
Please note, ifthere is no 'Reading', then the row is blank. But if there is...