You may want to consult ICH E6(R2), section 4.9.3 directly:
"...Sponsors should provide guidance to investigators and/or the investigator's designated representatives on making such corrections...."
In combination with´8.3.14 ("To document that the investigator or authorized member of the investigator's staff confirms the observations recorded") and 8.3.15, I assume a (documented) delegation to a adequately qualified and trained individual is acceptable for signing data correction forms.