There were a few typos in above note but I am not able to edit: Pasting below again:

##Background:
1) Some questions in the survey were supposed to shown to male respondents, some to females and a few to Both
2) We had created addional attribute and used 1 for male and 2 for female and 3 For both.
3) We applied question skip logics from additional attributes.
4) By mistake we upload M for Male and F for Female.
5) Questions got skipped and we had data loss.

###Feature request:
This is very similar to data input validation in excel sheets where we can define a list of items that can be input in a column. Other values can not be entred in the cells.

##How I visualize it should work:
While adding addtional attributes we are also able to define that the attribute is categorical or free text. If it is categorical then we can define the list of allowed items.
While uploading tokens if items in addional attribute do not match predefined items then tokens should not upload.