Choice Field Trigger

Hi to all!

I have got this structure:

MasterSearchTable - fields:

1. Choice Dynamic
2. MusicBrainz ID

MBIDsTable - fields:

1. MBID
2. Description

as you can see the Choice Dynamic field is correctly connected to the MBIDsTable .

i am setting top a trigger in the choice dynamic:

let xMBID := 'Choice (dynamic)';
'MusicBrainz ID' := xMBID

Copy

and this trigger return the ID of the record correctly.

The question is: how can I return the field MBID of the record and not the ID?

Thank you in advance