Strange effects when building Arch packages

While the build of a package in home:munix9:gambas works without any problems, in home:munix9:gambas:test the almost same package is suddenly displayed as “unresolvable”. This means that system packages are missing that are actually there. Even stranger is that the build in home:munix9:gambas:test has already worked, and after a few tests “unresolvable” is suddenly displayed. Does anyone have a helpful explanation for this? Thanks & regards