Solution : https://service.sap.com/sap/support/notes/883328 (SAP Service marketplace login required)
Key words : 
source site type target site type   consumer   flow context, sap menu -> tools -> data exchange -> object management -> customizing objects, srms_pr_bdoc_mlan_tab transaction se11 -> data type = srms_pr_bdoc_mlan_tab press create, srms_pr_bdoc_mlan transaction se11 -> data type = srms_pr_bdoc_mlan, object class       customizing block size         100, line type = srms_pr_bdoc_mlan select, initial flow contexts tab, transfer brazil tax data, /3 crm    crm mbdoc validate, include structure '/1crmg0/mlan01'
Related Notes : 
       
| 970320 | Brazil localization solution in SRM 5.0 release | 
| 910511 | Tax Condition IPI2 for Brazil is displayed in Shopping cart | 
| 893940 | Brazilian localization in SRM 4.0/5.0 | 
| 870434 | EBP: Brazil specific fields in the Product Master | 
| 646005 | Brazilian Tax Regions in EBP |