I want to be able to set a default value of a field to another field in that table or a parent table. I found how to set concrete default values (e.g. 4), but not an option to calculate it based on other fields. Is it possible?
To elaborate my specific problem: I have a table of reagents. For each reagent, there is a recommended concentration by the manufacturer. In addition, I have a table of reagents used in specific tasks, which is connected to the reagents table. When a user enters a new task they need to connect to it all the reagents used and their concentrations. These are usually the same as the recommended concentration of the manufacturer, but can be altered for different tasks. So, ideally I would like that when a user picks a reagent, he would get a default value for the 'concentration' field. That value should be inherited from the 'recommended concentration' field of the reagent. Then the user decides if he wants to keep it or put in a new value.
I hope this is clear. Thank you for your help,