Message SAP FC140 - Reset company code data before changing the chart of accounts

Diagnosis
You have selected a different chart of accounts for a company code.
You must, however, reset the company code-specific data for the oldchart of accounts beforehand.

Procedure
If you really want to allocate a different chart of accounts to thecompany code, first of all reset the company-code specific data for theold chart of accounts.
First of all you must, if it exists, reset the transaction data forthis company code.
Finally, carry out the resetting of the company code-dependent G/Laccount master data (without the general master data).
Note:
When dealing with large quantities of data, resetting the master dataor transaction data can be very time-consuming. In this case, it isadvisable to schedule the running of these reports as a batch run.