There are KeyLAB Validations cells which are cells you can put into a input sheet. this article will explain what they do and how they work.
The validation cells are a way to controlling the input of data on the sheets. If you have a validation cell on your sheet you can use a logical equation like =IF(A1="","There is a problem",""). When we run the test sheet if cell A1 doesn't have anything in it when we try and save the report we will get a message and It will not let the report be saved.
To add these cells you will need to edit the sheet. They can only be put onto input sheets and they are under Insert.
Once you have added the cell to the sheet you can start to build the logic equation to make it work. You need to have a text based Logic equation. For example =IF(A1="","There is a problem","") so if there is nothing in A1 then the cell would present "there is a problem". These can use any trigger for example; any if, If(iserror and if(countif. They can be as complex as are needed. You can also have more than one if required.