you describe an unsupported scenario. The schema containing the BW data must not be read using HANA data models. Two main reasons: you would circumvent BW security and you would potentially inconsistent results since there would be no logic related to the request status in BW (you might read data of a red request).
Either combine the HANA models with BW data using a composite provider in BW or load the BW data into a separate schema in the HANA database.
SAP Customer Solution Adoption (CSA)