Overview:
When saving a record in CRM, the user receives an error: The data you were trying to access could not be found. It may be due to another user deleting the data or a system error. If you know the data is not deleted but cannot access it, please look at our support page.
Root Cause:
A Salesforce Id referenced in the object or related objects may not exist.
Solution:
Verify all Ids referenced on the object or related objects (if there are any triggers that modify those objects) are valid and not deleted.
Example:
If a user receives the Error while saving a Territory Specific Field (TSF) record, look into the TSF and Account to make sure all Salesforce Ids are valid. A cause can be that the Primary_Parent_vod__c is deleted and needs to be nulled.
Related Documentation:
CRM Help Documentation: N/A