Permissible Use Accesses

The following graphic indicates which use accesses to provider package interfaces comply with package concept rules.

For packages at the same level

Only packages P1 and P2 are entered in interface I3 as exclusive users. P4 cannot have use access to I3. 

For packages in different hierarchies within the same main package.

The use access cannot break through a package - that is, access a provider package without using an interface (see the graphic on the right). Nor can the provider access a user package without an interface. Use access is only granted after all the relevant surrounding packages have also received their use accesses (package P1_1, in the graphic on the left).

For packages in different main packages

You must first create the use access for the main package surrounding user package P1_1. The user package can then access interface I2 to the provider package.

Packages can only access elements in another main package using an interface.