If you select one value, the field with its value

[vaynberg]

Hello! Please tell me how I can do, I'm tired of fighting.
I made two entities Regions and Disctricts
I need to allow when in the counterparty card I select Regions in the field Districts were only those that belong to Regions.
I have a link to regions in which there are fields regionsId and regionsName

[shalmaxb]

It maybe something like this: https://docs.espocrm.com/development...ic-multi-enum/