Hi Manuel,
Package ZBASIS does not exist
Then assign new package like this and modify your program...
Follow this procedure :
In SE38, enter your program name.
Then use the menu option "goto -> object directory entry". Click on "Change", and you can enter the new package.
You'll be prompted for a workbench request number also. The same technique can be used to change packages in other objects.
You can also use transaction SE03 (or the tools option from SE09/SE10), but access is sometimes restricted.
Regards,
Ramesh.T