The present invention provides a method to produce a recombinant Mononegavirales virus vector harbouring an additional transcription unit comprising a foreign gene operatively linked with an upstream Mononegavirales virus gene start (GS) sequence and a downstream Mononegavirales virus gene end (GE) sequence, characterized in that the foreign gene sequence encodes a protein, which protein contains a stretch of at least three basic amino acids and the nucleotide sequence of the codons encoding these amino acids does not contain a sequence that can be recognized by the viral polymerase of the Mononegavirales virus as a gene end (GE) sequence.
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