Huge AR DSO Change Log

In SAP BW Change Log for DSO Accounts Receivable is ~600GB and has 1537 log requests. The total record count for this table is 600M and it has data for 3 years only from Aug 2012.

AR DSO is pulled from two different data sources 0FI_GL_4 & 0FI_AR_3

This AR DSO is an intermediate table which is used to update the AR cube where all reports are built. This intermediate table has all the business logic .

Has anyone come across such Huge Change Log table and remidation on reducing the size

Thanks

Abhishek Shanbhogue