Error in EEWB when a n Extension is changed

Question

Hello,
I need to add some more custom fields in Opportunity tab. There were already some existing fields created using Project Extension(say it is PE1) in EEWB. But I am facing some problems
(1) To add the new ones, when I created a new Extension PE2 for BO:-OPPORTUNITY  Extension ty:-OPPORT_H(PE1 was also created for the same values), this gave an error "The Project could not be read". When I just tried another values for BO and Ext type, it did work.
(2) Since (1) did not give any results, I 'Start Wizard' for PE1. and add the new fields in that. This works fine. 
Later date I found that some of the fields from the new list should be deleted, so I triggered 'Back to Previous version' for the PE1 . But this gave some errors:
"Error during deletion of object: Field."
and I was not able to revert the structures back to Previous version.
(3) jsut getting out of the way, after PE1 showed errorneous status, I tried to create PE2(with the same BO and Ext ty) to add trial fields and this again worked.
Can anyone give some reasoning for the above behavior of EEWB for cases 1,2 &3 and mentioned above.

Answer 1

HI Nirmit,
   Yes you are right. EEWB will not support the deletion of a project if any errors are found. for your serino (1) u revert back to previous version and when that project is fine u can delete the complete project.
Regard point (2) if PE(1) was fine ( i.e without errors) then u can use start wizard and at the place where u ad fileds u can deelte the fileds . this works fine in CRM 4.0.
Point (3) is the way to overcome but always u can delete ur PE1 if it does not have errors