@Ofelia Bogdan
When I was an Apptio client we tried both ways for the large contracts. The line item granular detail was not worth all the effort that it took. We ended up using the line item detail to get the weighted allocations for the year and would allocate the contract based on that. Each new year we would verify or update the weights to be used for that year. May not have been exact allocations but it was close and much easier to maintain.
#ApptioforAll