Solution : https://service.sap.com/sap/support/notes/861890 (SAP Service marketplace login required)
Key words : 
sapbwnews bw sp14 netweaver'04 stack 14, 10 content            import support package 22, 0b            import support package 28, 1 content support package 22, 50            import support package 14, customer-specific tables, missing tadir entries, 0b support package 28, support packages listed, upgrade tool import
Related Notes : 
       
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| 1146580 | Add. info.: Upgrade to SAP NetWeaver 7.0 EHP 1 (ABAP) | 
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| 1099841 | Add. info.: Upgrade to SAP NW 7.0 Support Rel. 3 ABAP | 
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| 1010762 | Add. info. on upgrading to SAP SCM 5.1 ABAP | 
| 961512 | Add. info. on upgrading to SAP SCM 5.0 SR2 ABAP | 
| 960783 | Add. info.: Upgrade to SAP NW 7.0 Support Rel. 2 ABAP | 
| 925240 | Add. Info. on upgrading to SAP SCM 5.0 SR1 ABAP | 
| 920420 | Conversion of DataStore objects not successful | 
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| 781633 | Additional Information: Upgrade to SAP BW 3.50 SR 1 | 
| 658992 | Additional information for the upgrade to BW 3.50 |