ONUSOURCE pseudovariable
The ONUSOURCE pseudovariable sets the current value of the ONUSOURCE built-in function.
The element value assigned to the pseudovariable is converted to
a UCHAR string and, if necessary, is padded on the right with UCHAR
blanks or truncated to match the length of the field that raised the
CONVERSION condition. The string is used when the conversion is attempted
again. (See conversions in Data conversion.)
The pseudovariable must not be used out of context.