Solution : https://service.sap.com/sap/support/notes/531937 (SAP Service marketplace login required)
Key words : 
long text logs generated, gxp-relevant long texts, prerequisites prerequisite rel, ph-elr add-, > start date     <date, long text logs, log long text, long text logging, overview list displayed, gxp-relevant reason
Related Notes : 
       
| 1058984 | Frequent audit trail problems (transactions AUT01-AUT10) | 
| 522889 | AUT05, AUT_DEL: TIMEOUT |