Hi Yossi,

i think you want force a null to a string null variable.

use this

* if you want preserve right spacing
* before use lxVariableOfUnknownType force its type with this
lxVariableOfUnknownType=RTRIM(NULL)
* now lxVariableOfUnknownType is a "C" type
* if you can trim, use
lxVariableOfUnknownType=RTRIM(lxVariableOfUnknownType)

Fabio