Flash API Write

Hello,

i'm working with the TMX320 F28377DZWTT device and have some problems with writing to the Flash.

I executed the following example code and viewed the memory with the memory browser in the Code Composer Studio.
The code contains 3 Flash api write calls, all writing 1 word, but the second call doesn't write the desired word to flash. The other 2 calls are OK.

Are there some restrictions i forgot about?

The return values are always Fapi_Status_Success.

    
    //Flash sector H erased before,

    EALLOW;

    //start of sector H
    uint16_t* pu16StartAddress = (uint16_t*)0xA0000;
    uint16_t pu16DataBuffer = 0x0FFF;
    uint16_t ui16WordsToWrite = 1;

    //working, data@0xA0000 changes to 0x0FFF
	oReturnCheck = Fapi_issueProgrammingCommand((uint32_t*)pu16StartAddress,
												&pu16DataBuffer,
												ui16WordsToWrite,
												0,
												0,
												Fapi_AutoEccGeneration);
	while(Fapi_checkFsmForReady() == Fapi_Status_FsmBusy);


    pu16StartAddress = pu16StartAddress+1;	//0xA0001
    pu16DataBuffer = 0x3FFF;

    //not working, data @0xA0001 remains 0xFFFF
	oReturnCheck = Fapi_issueProgrammingCommand((uint32_t*)pu16StartAddress,
												&pu16DataBuffer,
												ui16WordsToWrite,
												0,
												0,
												Fapi_AutoEccGeneration);
	while(Fapi_checkFsmForReady() == Fapi_Status_FsmBusy);


	pu16DataBuffer = 0x0FFF;	
       //working, data@0xA0001 changes to 0x0FFF
	oReturnCheck = Fapi_issueProgrammingCommand((uint32_t*)pu16StartAddress,
												&pu16DataBuffer,
												ui16WordsToWrite,
												0,
												0,
												Fapi_AutoEccGeneration);
	while(Fapi_checkFsmForReady() == Fapi_Status_FsmBusy);