Error creating External view on HANA Live model in CRM

Hi, I'm getting the following error when trying to create an External View on HANA Live models in CRM e.g. sap.hba.crm.BusinessTransactionType:

Generation of external view ZCRM_BUSTRXTYPE from DB view sap.hba.crm/BUSINESSTRANSACTIONTYPE

View sap.hba.crm/BUSINESSTRANSACTIONTYPE (schema _SYS_BIC) does not contain any columns in the database

We are on ABAP 740 and HANA Rev 73.

The tables referenced in the view are all in the Column Store.

Is there a restriction on creating external views on HANA Live models?

I made a copy of of the HANA Live model and was able to successfully create the External view on the copy.

Please advise.

Thanks

Peter