There seems to be no standard way to update this field via RFC (BAPI) in our system (Release 7.02). If you are running an industry solution there is a slight change that there may be released functions to do this, but it's not very likely.
You will need an ABAP programmer to create an RFC to update this table. Caution!! I'm also unable to find an internal released function module within SAP to update this table. Function module J_1IMTCHID_POST
is the only FM that updates this table in our system, and has not been released for customer use, and effectively does a direct table update of a SAP standard table, which is rarely advisable.
If you decide to go down this route (or have no other choice), it is very important that you ensure that any updates to this table honours SAP's intended use of the table, as any corruption of the data as a result of your change will not be supported under the SAP maintenance agreement.