Thota and Janusz, this is going around in circles
Thota: I’m not sure what webMethods support told you but webMethods 6+ CAN support old Enterprise adapters.
The old Enterprise adapters CAN be used in webMethods version 6+, however (as I mentioned above) you will need to use the Enterprise Integrator and Adapter Manager tool to create/configure/test/debug the adapters. The old adapters can be pointed to version 6+ brokers or continue to point to pre-version 6 brokers.
If you want (need) to use a broker with IS version 6+ then it must be a version 6+ broker. You cannot connect IS 6+ to a pre-version 6 broker. You have the option of upgrading your pre-version 6 brokers, or if you don’t (can’t) upgrade your broker you can create a webMethods Territory and put a new 6.0.1. broker in it along with your 5.0.1. broker.
Have a look at the document “Leveraging webMethods 6 with Previous webMethods Solutions”. If you have version 6 installed you can find this doc under <webmethods>\doc directory. It is called LeveragingWM6.pdf. You can also find this document at the webMethods Advantage web site: Select Bookshelf, then webMethods Integration Platfom.
You should also read the webMethods Integration Platform Upgrade Guide for version 6.0.1.
If you are still not clear on this contact me directly at my personal email.