The function VALUE() in Object REXX

The function <VALUE fails with the error REX0040E (Incorrect call to 
routine) if you're trying to change the contents of an environment 
variable and the length of the value of another environment variable is 
greater than 725. 

Source: Mario Semo (see EMail Addresses) 
[Fixed in OBJREXX 6.00 26 Feb 1997 and newer versions (included in WARP 4 
Fixpack #6)]