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Validation function with helper column
I have 4 columns in a sheet. First column contains Ac/No of client. Second
contains conference calling line, weather unlimited or limited typed as U or L. Third contains minutes client used. Fourth contains countries, like USA, Canada, UK, AUS, NZ etc. I use unlimited U calling lines for calling USA, UK and Canada and limited L ( pre-paid card ) for ALL other countries¦.--- ( including USA, UK and Canada ) A B C D 1 45921 U 51 USA 2 81345 L NZ 3 34821 U 2 CANADA 4 42301 U UK 5 34510 U 12 USA 6 36210 L AUS Since limited L is more costly than unlimited U ( for usa, uk, and canada ) I want to restrict use of limited L until all 4 unlimited U are occupied. I think I need to make some helper column and then use some validation formula but cant make it work. In above example, only 1 U is occupied right now ( B4 ) and 3 are free. ( Since there is only 1 cell next to U thats empty. ). So I should NOT be able to enter L in column B right now IF country in D is either USA, UK or Canda. TIA |
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