the value of 0MAINTPLANT can't find in master data of 0NOTIFICATN

Hi All.

I met a problem.

I want to load data to 0NOTIFICATN ,after I finished it, I found a record. 0NOTIFICATN=10000992, 0MAINTPLANT = '',but when I looked up the the record in the PSA, QMNUM = 10000992, SWERK = '0022',in the transformation,QMNUM ---> 0NOTIFICATN,SWERK ---> 0MAINTPLANT.

I looked up other record,they had no problem.

So I delete the DTP request from 0NOTIFICATN,and loaded data again,I found 0NOTIFICATN=10000992, 0MAINTPLANT = '0022', I didn't change the filter of the DTP,and the PSA is the old.

I don't know why.

Best regards.