Deleting Retrieval Argument generates DW Error

When attempting to delete a retrieval argument company_num from a report query which looks successful then generates an error: DataWindow Error "Line 22 Column 22834:incorrect syntax".

Then DataWindow "Unable to run 'C:\......xyz.pbl(dw.....pblname) attempt to rerun the report brings up DataWindow Error "Line 22...... again and again.

You finally have to say "No" to save and nothing has changed.

Any help would be appreciated.

Thanks,

Wayne