Solution : https://service.sap.com/sap/support/notes/1504498 (SAP Service marketplace login required)
Summary : 
      This SAP Note addresses arithmetic overflow errors triggered by extensive data volumes in the OLAP cache. Incorporate Support Packages for SAP NetWeaver BW versions 7.00 through 7.30 to remedy these issues, enhancing cache size internal representation compatibility. Manual adjustments to the data dictionary structure are necessary prior to implementation, including changing 'size_aggr' component type from 'INT4' to 'ABAP_MSIZE' in SE11 transaction. Upcoming Support Package details will further support modifications, yet interim corrections may utilize preliminary versions detailed in related SAP Notes.
Key words : 
software component   sap_bw                        business inform, solution sap netweaver bw 7, sapbwnews nw bw 7, arithmetic overflow errors, manual pre-implement, release 700          sapkw70020 - sapkw70024, release 701          sapkw70103 - sapkw70107, release 702          sapkw70201 - sapkw70205, sap netweaver bw 7, sap nw bw7
Related Notes : 
       
| 1555876 | BCD_OVERFLOW error in OLAP cache mode 5 statistics | 
| 1500078 | SAPBWNews NW BW 7.02 ABAP SP06 | 
| 1471463 | SAPBWNews NW BW 7.01 ABAP SP08 | 
| 1468668 | SAPBWNews NW7.0 BW ABAP Support Package 25 | 
| 1392433 | SAPBINews NW7.11 BW ABAP Support Package 05 |