We have a solution, written in CRM 2011. (All CRM Online)
It has been imported into a 2013 development environment as an unmanaged solution and works fine.
We have now deployed it to a demo site as a Managed solution.
When I open the opportunity form to create a new record I get:
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Message from webpage
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There was an error with this field's customized event.
Field:window
Event:onload
Error:Object doesn't support property or method 'Form_onload'
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OK
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This happens on both the Opportunity and Information version of the form. We do have some JS onload but the function is not 'Form_onload' and is not references as such anywhere. All is well on the dev site.
I have disabled the JS on the form and still get the error.
Is this an internal CRM issue perhaps related to 2011/2013 or can I be causing this somehow?