Suggestion Disable CT input for Subordinate Inverters

Having just recently installing a system with 2 x 18KPv in a Primary / Subordinate arrangement, it was observed that the hybrid operation was very erratic switching from drawing power from the utility up to 3Kw to sending power back to the Grid up to 2Kw constantly (Note - Grid sell is disabled).  The cause was discovered to be the installation of the CTs for both inverters (apparently only one set is required on the Primary Inverter).  This is illustrated in the Drawings however not mentioned anywhere in the manuals.  As a suggestion, it would be great to simply have the inverter disregard the CT input whenever the Subordinate option is selected via software. This would give the flexibility of switching the Primary Inverter unit if the need arises.