Solution : https://service.sap.com/sap/support/notes/1486670 (SAP Service marketplace login required)
Key words : 
table maintainence generator transaction codes-----------------------------------------------refer, table maintainence generator transaction codes-----------------------------------------------1, fi accounting details table bseg, reusing existing tax codes, tax data-----------tax expiration date, saft pt master data, tax code reuse process, current line item details, german / portuguese specific translation, package id-fi-pt
Related Notes : 
       
| 1487660 | SAFT-PT: Updated manuals for implmentation | 
| 1459306 | SAFT-PT: Collective note for SAFT-PT notes |