Whenever using the function for transferring data from one ID to the other
(transferring subejct-related data, as well as item-related data, transferring
posts) you have to select IDs from the tables or enter them manually.
In case you want to transfer records to an ID which does not exist in the
register the following warning is returned:

It is recommended that you cancel transfer clicking
and make sure that the record exists in the register by selecting it from
selection table in the field where you select IDs.