Error in step two of Mosaic Purchasing Data Import Applies to version 25.1

Error:
​'E1003 - An error occurred during execution of a COM library method. Extra error information: System.Runtime.InteropServices.COMException (0x800A0CC1): Item cannot be found in the collection corresponding to the requested name or ordinal.
​at ADODB.Fields.get_Item(Object Index)
​at ADODB.InternalFields.get_Item(Object index)
​at AbacusClientServer.SubmitTransactions.fnSubmitTransactions(String strConnectionString, Object[] varArrFailList, Object[,]& varDataArray, Object[] varAuditLogDetails, Int32& lngReturnClientID, String& strErrorMsg)'

This is a bug in the 25.1 job service that is preventing the update of existing client details in some cases.

Please raise a new case online and include any relevant logs or error messages.