Salesforce JIRA Validation Failed

[Agnes Böttcher]

When trying to create a Jira Issue via Salesforce the following message pops up:

Jira validation failed! customfield_11124: Account ID 00G4J000000Vd99UAC does not exist.

The customfield_11124 is the Owner in Jira and our Account IDs start with 0014J...

We mapped the Jira Owner with the SF Owner, so I don't know why it says Account ID (and in addition mentions an ID which does not exist in our ORG). 

Can anybody help me?

[Agnes Böttcher · Accepted solution]

Solved the problem, after escalation of the case the case owner changed to the support team, so the mapping for case owner - Jira issue owner failed. The case owner needs to be one person. Still wondering why the error is AccountID and not case owner.