Solution : https://service.sap.com/sap/support/notes/1155096 (SAP Service marketplace login required)
Key words :
customer component bw-bct-grc-ac sap grc access control priority correction, actual system master data function bp master data header data released, low priority category program error validity software componentfrom rel, subsequentbi_cont703703 support packages & patches support packagessoftware componentreleasesupport packagebi_cont703sapkibiiq0, __%pdfstyle%__ / } symptom master data process chain stalls, edit process type 'attribute change run', / __%pdfstyle%__font-size, attribute change run step, data activation step fails, master data activation