Rna-dependent RNA polymerase part of the packaging complex that packages the viral RNA segments, replicate them into a double-stranded form and transcribe them. a ribonucleoside 5'-triphosphate + RNA(n) = diphosphate + RNA(n+1) Part of the packaging complex composed of RDRP, P4 and P7. Interacts with P7 (Probable). Found in the capsid (12 copies). Prior to RNA packaging, localizes on the inner procapsid surface near the three-fold axis of symmetry. Was originally thought to be a capsid protein.