SCSM Authoring Tool verification error when creating a new property

Question

I am needing to add several new fields to an existing customized ServiceRequest Extended Form.  Using SCSM I exported the management pack (as a bundle) and then used PowerShell to export to a .xml.   Now when I open the class and try
to create a new property I get an error stating:
The management pack could not be verified due to this error:
Verification failed with 1 errors:
Error 1:
Found error in ...servicerequestextendedform.category with message:
The Target attribute value is not valid.  Element ....ServiceRequestExtendedForm.Category references a Target element that cannot be found.
I am very new to this.   Any help would be greatly appreciated!

Answer 1

you probably want to go back to original sources, rather then exporting from Service Manager, since the export will break any sealing and might cause issues when authoring or resealing. 
You'll also need :
a Sealed version of the class extension, since this is going to need to be loaded into the authoring tool before you see the extra properties,
an unsealed copy of the MP that contains the form customization, so you can edit it 
the original key used to seal the current customization, so you can seal the upgraded form using the same key so it will upgrade the MP correctly in your production environment.
The specific error you're running into looks like a MP reference error, but it's hard to be sure without seeing the original XML. i'd make sure that you have opened the sealed versions of any other MPs this MP depends upon.