Return reason defaulting from header to line

HI All,

We have 3 order types

RMA with credit -- this is a mixed order type with a return order header workflow

RMA without credit - this is a return order type with a return order header workflow

Replacement - this is a mixed order type with a standard order header workflow

Tried creating an order using RMA With credit order type and entered the return reason code at the order header level(present in the others tab of sales order form) and saved the order header. Created a new return order line on this order(with quantity  as -1) but the return reason code field in the returns field is not defaulted to what was selected at the header level. It is asking user to input it.