When creating a case through the portal, the user sets the case Assignee using a code. Though, the [Assignee] field remains blank after saving the record.

Question

When creating a case through the portal, the user sets the case Assignee using a code. Though, the [Assignee] field remains blank after saving the record.

Answer

When you save a Case object (the Portal package), you basically run the event sub-process defined in the CaseInserting event of the object. If you meet the UserType = SSP condition in this process,  the [Assignee] field is cleared.