BDC mm01

Am creating bdc program for mm01 using call transaction method.. when i give 'A' mode the data will not populate into the corresponding screen... only first screen and view only working after that plant and corresponding screens field not populate data.....

while i debug that program the data from flat file is populate to internal table and corresponding data also populate to BDCDATA internal table......

only the problem beging in while transferring of data to corresponding fields......