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Given ColumnA contains a Text header (A1), an allowed maximum number (A2), fifty tickboxes (A3:A62) and a formula in A63 of: =countif(A3:A62,TRUE) how can I block application of more than the a...
#1: Initial revision
Data validation applied to tickboxes
Given ColumnA contains a Text header (A1), an allowed maximum number (A2), fifty tickboxes (A3:A62) and a formula in A63 of: =countif(A3:A62,TRUE) how can I block application of more than the allowed maximum number of ticks, or at least warn that the limit has been exceeded? <sub>There is a [Q](https://webapps.stackexchange.com/questions/143665/google-sheet-column-tick-box-validation) on Web Applications [WA] that remains unanswered after three months with a problem of the kind outlined above. On WA the tag at present is [google-sheets-query] but why so is not clear to me.</sub>