SAP Message WRF_REF303 - Table conversion failed. Program abort.

Diagnosis
Table conversation of FRE_DB_ART_SITE or FRE_MD_PRODUCT failed. Thisconversion is necessary after upgrade from F&R Rel. 4.1 to F
R rel. 5.0.
A reason for this error may be a lock problem or an update error.

Procedure
Try again