LIS-BW-VB_APPLICATION_12_400 is failing because of Structure change

In our system i.e.. R/3 side LBWQ is broken because of extract structure change in data source and data is there in LBWQ.

'LIS-BW-VB_APPLICATION_12_400', this program is the one which transfers data from LBWQ to RSA7 and it is failing now because of the change structure.

How can we correct this with out loosing data.