It indicates that found more than 1 document in the document cache. There is a Database SQL call that returns one record. The SQL table only has 1 Record.
Error Message is as follows: <Description>Found more than 1 document in the document cache (index: MRN/Ref, keys: [PatientId_Ext (Statement/Fields/PatientId_Ext) = BROSTE01031962, MIR_schedule_id_ext (Statement/Fields/MIR_schedule_id_ext) = 74542])</Description>.
Process has been deployed for a while, problem just started.
Support suggested I do a document split. However, there are not multiple records on the SQL table.