For the Chart ID #, Medical Record #, and MPI Number chart data fields, an additional Assigning Authority section is available in the Chart Data Field Settings dialog box. Change the settings in this section only if your system needs to be configured to use overlapping values for these identifiers.
Signature Deficiencies for Epic does not support the use of assigning authorities with the Chart ID # field (which is field #10). If the Chart ID # field is configured to require an assigning authority, then the Analysis and Signing components will be unable to retrieve documents using the values passed from Epic.
See the OnBase HL7 documentation for information about configuring chart data fields for assigning authorities.