This is my sample file
#%cty_id1,#%ccy_id2,#%cty_src,#%cty_cd3,#%cty_nm4,#%cty_reg5,#%cty_natnl6,#%cty_bus7,#%cty_data8 690,ALL2,,AL,ALBALODMNIA,,,, 90,ALL2,,
If that's the only problem (and if you never have a comma in the field bt_cty_ccy_id), then you could remove such an extra comma by loading your file into an editor that supports regexes and have it replace
bt_cty_ccy_id
^([^,]*,[^,]*,[^,]*,),(?="[A-Z]{2}")
with \1.
\1