Variable size file depends on a Copybook field value

Hi guys

I have a file that I receive via FTP, this file is in EBCDIC format and does not have RDW.
In Copybook there is a field MODEL-DECISION PIC X(01). that coming S or N (Yes or No)

If I have S, I have to read another 60 bytes fields complements MODEL-COMPLEMENT: MODEL-FIELD-18, MODEL-FIELD-19, MODEL-FIELD-20, 220 bytes total
If it has N, I don't have to read anything else and in this case I would jump to the next record, total 160 bytes
I made this Copybook with REDEFINES to try to make Spark could read, sometimes 220 bytes, sometimes read 160 bytes, but is doesn't work. MODEL-FILLER-1 PIC X.

I've already tried to use several possible combinations:
.option("is_record_sequence", "true")
.option("is_rdw_part_of_record_length", true)
.option ("record_length_field", "160") or 220

Here's a print of the file and the Copybook

Can you help me?

01 MODEL-REG.
03 MODEL-FIELD-1 PIC 9(09) COMP-3.
03 MODEL-FIELD-2 PIC 9(05) COMP-3.
03 MODEL-FIELD-3 PIC 9(02).
03 MODEL-FIELD-4 PIC X(55).
03 MODEL-FIELD-5 PIC X(01).
03 MODEL-FIELD-6 PIC X(04).
03 MODEL-FIELD-7 PIC X(45).
03 MODEL-FIELD-8 PIC X(06).
03 MODEL-FIELD-9 PIC X(19).
03 MODEL-FIELD-10 PIC 9(09) COMP-3.
03 MODEL-FIELD-11 PIC X(02).
03 MODEL-FIELD-12 PIC 9(05) COMP-3.
03 MODEL-FIELD-13 PIC X(01).
03 MODEL-FIELD-14 PIC 9(05) COMP-3.
03 MODEL-FIELD-15 PIC 9(05) COMP-3.
03 MODEL-FIELD-16 PIC 9(04) COMP.
03 MODEL-DECISION PIC X(01).
03 MODEL-COMPLEMENT.
05 MODEL-FIELD-18 PIC X(55).
05 MODEL-FIELD-19 PIC X(01).
05 MODEL-FIELD-20 PIC 9(04).
03 MODEL-NO-DECISION REDEFINES MODEL-COMPLEMENT.
05 MODEL-FILLER-1 PIC X.