Enhancements to the CPYTOIMPF command and the CPYFRMIMPF command for V5R4:

When the from-file character fields contain a string of blank characters, the CPYTOIMPF command and the CPYFRMIMPF command keep one single blank in the corresponding to-file field, unless you have specified *NONE for the RMVBLANK parameter.
A string escape character (STRESCCHR) parameter has been added to indicate that a string delimiter should be treated as a normal character. This new parameter allows import utilities to parse the delimiter character correctly, when the string delimiter itself is a character in a string field.
A special value *DBLQUOTE is provided as the default value for the string delimiter (STRDLM ) parameter, to indicate that the double quotation mark character is used as string delimiter.
A from CCSID (FROMCCSID) parameter has been added for the CPYTOIMPF command. This parameter can be used to specify the CCSID to be used when the from-file field is 65535.
A to CCSID (TOCCSID) parameter has been added for the CPYFRMIMPF command. This parameter can be used to specify the CCSID to be used when the CCSID of the to-file field is 65535.
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Was the exact same procedure working before you put on the PTFs?
Is it because of NULL values?