Solution : https://service.sap.com/sap/support/notes/1476775 (SAP Service marketplace login required)
Summary : 
      The SAP Note addresses an issue in BAPI_MDPROVIDER_GET_MEMBERS where it returns a master data ID (SID) instead of member unique name text when handling members or external hierarchies with values prefixed by "LEVEL". This occurs due to a bug in parsing MDX queries containing specific keywords such as LEVEL00 to LEVEL19. The recommended resolution is to import relevant Support Packages for different SAP NetWeaver BW versions (7.00, 7.01, 7.02, and 7.11) once associated SAP Notes detailing these packages are made available. In critical situations, correction instructions via SNOTE are advised following guidance from Note 875986.
Key words : 
solution sap netweaver bw 7, sap netweaver bw 7, sap nw bw 7, master data id, sapbinews nw bi 7, bapi bapi_mdprovider_get_members returns, 01 bw abap sp08, 00import support package 25, import support package 08, import support package 05
Related Notes : 
       
| 1471463 | SAPBWNews NW BW 7.01 ABAP SP08 | 
| 1468668 | SAPBWNews NW7.0 BW ABAP Support Package 25 | 
| 1450990 | SAPBWNews NW BW 7.02 ABAP SP05 | 
| 1392433 | SAPBINews NW7.11 BW ABAP Support Package 05 |