shared object created by one swf is not found by another swf

I have an included file which accesses a shared object created by a Master
SWF file.
This file is included into several FLA files and all the relevant SWF work
fine except one.
trace(so.data.my_parameter) returnes undefined

All the files are made re published on FLASH-8
The only difference is that here file is set for AS 1.0 whereas all the
othersincluding the Master SWF are for AS 2.0
Is there a chance that AS 2.0 places shared objects in a different location
than AS 1.0 expects to find it?
Or the reason is elsewhere?