Using the build-script on SLES15SP1

using a SLES15SP1, registered to SCC, trying to use the build script with
init_buildsystem --configdir /usr/lib/build/configs --cachedir /var/cache/build --repository zypp:// --clean squid.spec
results in 404-error, file not found.
Reason seems to be that the --repository zypp:// - mechanismen does not work with SCC, the URLs do look different from the URL I could retrieve from SCC packet search.
Failing URL is kind of
while working URL from SCC is kind of

Same build script works running against internal SMT server repos.
Does this means the build script can not handle zypp-repos pointing directly to SCC repos?