Include fields & attributes of other pages in the conditions for "validate field values" in VBS

Summary:

Currently in 'validate field values' feature in VBS you can only add fields & attribute of that page in the conditions.

It would be good to make it possible to also use fields & attributes of other pages in a condition. This would give more flexibility to cope with requirements of the client.

Example : we would need to have an error shown when someone wants to inactivate a department, and if this department is currently used in a still active position.

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