ZAPI_SALES_CONTRACT_SRV not working

Hi experts,

SAP S4HANA ON PREMISE 1909

We're trying to use Odata APIs as below picture. All other API such as ZAPI_PRODUCT_SRV + ZAPI_MATERIAL_DOCUMENT_SRV + ZAPI_BUSINESS_PARTNER + ZAPI_PURCHASECONTRACT_PROCESS + ZAPI_SALES_ORDER_SRV are working fine but ZAPI_SALES_CONTRACT_SRV : GET return empty value.

Sale Contract table VBAK has values

Something wrong ? What exactly Sales Contract API ?