In order to enable the search functionality, sap:searchable must be set to true for the root entity set. To enable additional search fields, specify additional PropertyPath values as shown in the code sample below.
<EntitySet Name="SEPMRA_C_PD_Product"EntityType="SEPMRA_PROD_MAN.SEPMRA_C_PD_ProductType" sap:searchable="true" sap:content-version="1"/>
<Annotations Target="SEPMRA_PROD_MAN.SEPMRA_C_PD_ProductType"> ... <Annotation Term="UI.SelectionFields"> <Collection> <PropertyPath>Price</PropertyPath> <PropertyPath>Supplier</PropertyPath> </Collection> </Annotation>