White space characters are defined as ASCII characters (hexadecimal) 'X'09 to 'X'0D and EBCDIC characters 'X'05, 'X'0B, 'X'0C, 'X'0D, 'X'25, and 'X'40.
You can specify these characters in your message model using TDS mnemonics if they are important to your processing, for example, to use as group terminators or delimiting characters. See Message Sets: TDS Mnemonics for further information.
Tag<data>!<Any white space character>Tag
where:ST*856*777777%<SPC><SPC><SPC><HEX 09>BSN*00*7654321*940920*10000%
The
sequence <SPC><SPC><SPC><HEX 09>
is
ignored by the parser.