SAP GB Efiling Deployment ECC5

Background: GB efiling is the feature provided by HMRC (GB Tax authority) to allow data exchange from company to them in term of tax report and tax data. SAP provides a solution to be able to exchange tax related data from SAP to HMRC. In the earliest version (4.6 to ECC5), it uses business connector as the middleware. Hence, the latest ECC6, the new XI (or later called by PI), is used.  This post is to cover the comprehensive steps to implement GB efiling.