CC2755R10: COEX_REQ error

Part Number: CC2755R10
Other Parts Discussed in Thread: CC3301,

Hi,

Our developing device uses CC2755R10 with CC3301 to use Zigbee and BLE/WiFi. Therefore I edited syscfg like below.


However, COEX_REQ and COEX_PRIORITY are not work. When it receives some packets, these 2 line are still Low.  To solve this problem, I edited rcl_stub_dmm.c like below.

DMM_WEAK_FUNC RCL_CommandStatus OVRDE_RCL_Command_submit(RCL_Handle h, RCL_Command_Handle c)

{
    ((RCL_CmdIeeeRxTx*)c)->coexControl.grantEnable = 1;
    ((RCL_CmdIeeeRxTx*)c)->coexControl.requestPriorityEnable = 1;
    return RCL_Command_submit(h, c);
}
 
By this change, COEX_REQ is become HIGH and COEX_PRIORITY is still Low  when it receives some packets. 
 
[Question]
1. Is this change correct? If no, could you tell me how to fix it?
2. Does COEX_PRIORITY not become High, when receive?