VALID returns a BIT(1) value that is '1'B under
the following conditions:
- If x is PICTURE and its contents are valid for x's
picture specification
- If x is FIXED DECIMAL and the data in x is
valid fixed decimal data
If these conditions are not met, the result is '0'B.
 >>-VALID(x)----------------------------------------------------><
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- x
- Reference with either picture or fixed decimal type.
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