Table field for PO releaser in R/3 (4.7 Enterprise)

Hi Gurus out there:

Do you know if there is a table field for PO releaser in R/3 (4.7 Enterprise)?

We use for e.g. the transaction ME29N to release a PO and I haven't been able to find a DB table where the PO releaser is stored.

In DB table EKKO I can find the fields FRGGR (Release group), FRGSX (Release strategy), FRGKE (Release Indicator), FRGZU (Release status) and FRGRL (Release Not Yet Completely Effected) but no information of the user who released the PO.

Many thanks in advance.

/hw