Hello Steve,
Thanks for your fast reply, i tried to configure proxy arp on the interface but failed with following message:
###Error, one IP in range [200.200.200.193 - 200.200.200.193] is used by mip/dip/vip!
What do you think about adding a static arp entry like https://kb.juniper.net/InfoCenter/index?page=content&id=KB26321&cat=SSG_5&actp=LIST