Definition
For each of the components Consolidation (FI-LC) and Consolidation (EC-CS), the standard SAP R/3 System contains a package which consists of the programs for converting the data of the respective Consolidation system.
Thus, the standard package contained in the standard system does not cover the Consolidation components.
Structure
As in the standard package, you must copy the relevant package for Consolidation from client 0 to either the test client or the production client. During preparations for the changeover to euros, you determine which ledgers and companies/consolidation units the package is to convert. See the Implementation Guide (IMG).
By explicitly including the ledger(s) in the changeover, you can exclude entire individual ledgers from the changeover of the ledger currency. For instance, this allows you to retain an additional copy of a ledger in DEM, which you created prior to the euro changeover, to keep historical data for purposes of DEM comparisons.
As a rule, you assign to only one package all ledgers that – because of their currency – qualify for the changeover and need to be changed over.
The FI-LC package
For this reason, if you use FI-LC you must specify all FI-LC ledgers (once only), standard and user-defined, prior to any changeover activities. Those ledgers in the FILCT database not specified are converted as part of the complete package.
The EC-CS package
Integration
The order pertains to both the actual date of the changeover as well as the ends of the fiscal years.
On the other hand, the changeover of an integrated company or consolidation unit must always take place before the individual statement data enters a new fiscal year.

Say, a company code and its corresponding company have different fiscal year variants:
In this case, the company must be changed over in the consolidation system as of 30 Sep 2000. The company cannot be changed over at 30 Sep 1999 because this date is prior to the changeover of the company code (31 Dec 1999). A changeover at 30 Sep 2001 is too late because then the individual statement data in euros would already be within a ‘euro fiscal year’.
To prevent the euro changeover from disrupting this status, you need to ensure that the ledger and the rollup company are included in the same package.
To ensure that the rollup is feasible, the consolidation group must use the same currency as the rollup unit in at least one version. The package must be created in a way in which this condition is met.