COBCH1688 Level 88 not allowed with value type

You cannot specify a level 88 condition for non-standard value types; that is, value types such as decimal, character, and value-type. However, you can specify level 88 conditions on standard value types, such as binary-long and float-short.

01 n1 decimal.             *> not allowed
  88 cond-1 value null.
01 c1 character.           *> not allowed
  00 cond-2 value null.
01 d1 type System.DateTime.*> not allowed
  88 cond-3 value null.
01 p1 type MyValueType.    *> not allowed
  88 cond-4 value null.
01 l1 float-long.          *> allowed
  88 cond-5 value null.
01 s1 binary-short.        *> allowed
  88 cond-6 value null.
end program.
valuetype-id MyValueType.
01 inst binary-long.
end valuetype.