Double-byte questions

I posted this on JDELIST, but have not yet received any responses, so I guess I 
should have posted it here in the first place!

To begin, I'll admit that I'm not that familiar with double-byte 
systems/environments.

We are currently maintaining JDE World source code for multiple countries in a 
single-byte development environment. 

We have discovered that when we move source code from the single-byte system to 
a double-byte system that we have to change some of fields in the DDS to be of 
the data type 'O' (Open) instead of 'A'(Alphanumeric) and re-create the files 
and programs in the double-byte environment in order to work properly.

My question is this:
Can we just use the data type 'O' for alphanumeric fields in BOTH the 
single-byte and double-byte systems, or will this cause a problem on the 
single-byte system?

This would save having to make the changes to the DDS when distributing code to 
the double-byte system...

Regards, 

--------------------
Steve Landess 
Austin, Texas 
(512) 423-0935