Huawei Prefix-List problems

[ImFound]

Hello,
we was trying out to integrate bgpq4 with our Huawei.
When we let execute the command "undo ip ipv6-prefix XXX" on the Huawei, it tells us "Error: This ipv6-prefix is being used.". So, it dosen't actually remove and then recreate with the need to reconfigure all the filters with the same IPv6 prefix.

Best Regards,
Alessio Cairoli

[job]

What should the bgpq4 utility do instead?

(I don't have access to a Huawei - so can't easily verify anything)