Multivalue virtual attribute propagation does not work properly: it is always propagated no more than one value during creation or update operatione.
Steps to reproduce the problem:
1. define some resource R which can have multivalue attributes (csv, ldap)
2. define a virtual attribute VA and map it (user mapping) to a multivalue attribute of resource R
3. give value A, B for VA in console for a user and also add resource R and save
Only A or B is writen to the resource R, both should be.