Landing spot when moving between linked forms

We have a client who has asked us to change the "landing spot" on a linked form, to consistently land in a particular field.

As an example, when moving from Form 51 (Purchase Invoice) to Form 55 (Purch. Invoice Subform) the cursor will land in the last field used on the subform by the particular user. Standard Navision seems to use the NextControl function to move from the Vendor Invoice No. field (Control ID 14) of the header to the Subform (Control ID 54).

Is there a way to default a specific Control ID as the landing spot within the Subform?

Any help is appreciated.