Ignore column from flat file

Hi,

I am using csv file(Flat file) as source and define the structure in BODS.

Issue with the flat file is its having some data outside of header column,

e.g:

Flat file have 21 column so for some rows some junk data is there in 23 or may be in column number 25.

How to handle this situation where DS can import only data for that column data which is defined in flat file.

While running this job I am getting this error:

A row delimiter was seen for row number <25> while processing column number <11>

Thanks!!