Hi All,
We have upgraded from crm 4.0 to crm 2011 (on-premise)
In CRM 4.0 we had few custom button on opportunity entity. (using ISV.config file).
After upgrade, this got converted into new tab on opportunity form with name "ISV opportunity Form" and all those custom buttons are under this tab.
We had requirement where all these buttons need to come out of that tab and sit inside main tab under 'Data' group.
I have successfuly done this by exporting opportunity entity and modifying ribbondiffxml by adding new custom action for each of those button with correct location.
After importing modified solution, all the buttons appered as per the requirement. All is good till now.
However, now if I change this solution again to hide one of this button.I am hiding button by using <HideCustomAction> syntex.
but it throws error. (See screenshot)

Now, I thought I might be doing something wrong so I remove <HideCustomAction> and brought back my solution to original state and try to Import again.
To my surprise it failed this timetoo . ( this is the same solution which i had successfully imported before).
Now to my knowledge, I don't have to do anything in "Application Ribbon". (correct me if I am wrong)
What could be the reason for this ? any thoughts ??
Thanks for your time.