Solution : https://service.sap.com/sap/support/notes/1062559 (SAP Service marketplace login required)
Key words : 
p_spam check upgrade-relevant onlyso_obj object type, reading upgrade inforeu3 incorrect order number enteredeu4, table enhcrosst02 list outputt03 enhcross rebuild, nameso_vrs program status________ ______________________________call transaction se38, enhancement object types xh=enhancements, 24 30007 completed 14 22t01 subsequent build dwtree, reading spam queueeu2 error, long lock situations occur, eu6 transport order number, tab page 'selection texts'
Related Notes : 
       
| 1622015 | Performance in deleting/renaming enhancement implementations | 
| 1346046 | Enhancement Framework: Performance problems | 
| 1222839 | Syntax error when importing SAPKB70011 | 
| 1138351 | Long runtime of background job SAPRUPGM |