From a finance standpoint of view, which are the main difficulties you have experienced trying to measure value captured from synergies levers, not mixing it up with the other business-as-usual initiatives running that could also affect the vision of how much you have really captured. Please consider difficulties in different aspects (SAP system chart of accounts, cost centers, billing systems tagging of what comes from synergies vs business-as-usual, BI analytics and reporting, other systems and tools).