input mapping

Hi,

Any views about below issue.In input it is expecting 23 fields but i want to pass either 21 or 23 fields in 010 record.

If i am passing 21 fields in 010 record i m getting below issue.

Input mapping `SOL42_V670_REL_FORINPUT.HEADER.STD_MAPPING' failed: token contains only 22 fields instead of 23

I know if i pass 23 fields it will work.But my requirement is that i have to  handle both 21 fields and 23 fields in 010 record.

NOTE:I am using only one input grammer file