LAUNCHXL-F280039C: F28003x PMBUS MFR command

Part Number: LAUNCHXL-F280039C

Tool/software:

Hi 

I have a project that uses PMBus as target and am currently working on the example of f28003x_pmbus_target_example from C2000 package.I would like to know how to add MFR specific command with a transaction type?For example, 0xD1 command for Read Byte

If I send 0xD1 command, the program goes to PMBusStack_target_assertionFailed(int,int) ()

I have one more question. Can I change the transaction type for standard command? For example, standard command 0x21 VOUT has a transaction type read word/write word. Can I change the transaction type to read byte/write byte?

Thanks in advance