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Dropdown list with non selected values

Question asked by jonasmn on May 15, 2016
Latest reply on May 18, 2016 by jonasmn

Hi,

 

The headline does not describe well what I am asking about.

 

I hava a table "Preparations" with substances. In another table "Preparationlist" I have selected some items from the table Preparations, that is the Preparationlist is a subset of Preparations, where  IDf_Preparations (table Preparationlist) is related to ID_Preparations (table Preparations).

 

When I enter a new record in the Preparationlist, I have a drop down menu with all the Preparations listed. All this works fine. BUT I would like the drop-down list ONLY to contain preparations from the Preparations table that are not already in the Preparationslist (not selected before). This to prevent the same substance to be chose twice.

 

I imagine that it should be possible to achieve this with a smart relationship in the relationship graph, but I am not the one to figure out how to do it.

 

Any tip?

 

 

 

Regards

Jonas Möller Nielsen

Sweden

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