Hey Gustavo,
In the FieldType documentation, for the MULTIPLE_RECORD_LINKS
field type you will see you have it in the options of the field, so to access it:
field.options.linkedTableId
I got it this way. If your field options are empty, maybe the field type is not MULTIPLE_RECORD_LINKS?
Cheers,
Ronen Babayoff
Superblocks.at