Posting to other cost center allowed

Hi

I have two company codes, 0001 and 0002.

Now i created one controlling area and assigned it to both the company codes.

Now i created one cost center as10000101 and i entered company code as 0001 into that cost center master.

I posted on expenses using FB60 for company code 0002. There i entered cost center 100000101 (which i created in company code 0001).

I was able to save and post the transactions. How can i restrict such postings?

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