Hi,
Lets check RIPE-530:
Re-allocation must be reflected in the RIPE Database. This re-allocation may be on either a permanent or non-permanent basis. LIRs that receive a re-allocation from another LIR cannot re-allocate complete or partial blocks of the same address space to another LIR within 24 months of receiving the re-allocation.
For temporary transfer we make 2 transfers: 1. from LIR A to LIR B. .... 2. Form LIR B to LIR A (back). While address space may not transfer it on within 24 months, so we can't transfer back earlier than in 2 years.
Ah, there is the misunderstanding. Giving back the address space is not a separate transfer. It's part of the original (temporary) transfer. This rule is only to prevent people from selling addresses on. - Sander