FDATA file missing

During my troubleshooting of a failed NONMEM run, I want to confirm the correct exclusion of some records (e.g., IGNORE CMT=2) for the input file. However, I could not find the FDATA file in the run directory. Is there any way to force NONMEM to generate a FDATA? I am also wondering about the possible causes of missing FDATA. Even the FDATA file is available, is it possible to include the column heads (e.g., ID, DV) on the top of the numbers? So, I can confirm which column is excluded or retained. In addition, I am not sure whether the dataset related warnings (e.g., DATA WARING 1, RECORD 100, DATA ITEM 11, THE DV IS NULL BUT MDV IS 0) is refereeing to the FDATA file or the raw input CSV file. In other words, the problematic record 100 represents the row 100 in the FDATA file or the CSV file? Thank you, Mark