Company code and Account code does not exist in SKB1 while entering GL Tran

I have created chart of accounts in the co code but getting error msg while posting entry in <Company Code>and<GL Account> transaction that entry does not exist in table SKB1. I have copied COA from existing SAP COA.

I was able to find the solution for the following messages

1. Fiscal Variant not connected to company code

2. Open Posting Period u2013 period 032009 not open (June-3)

3. The number range 01 is missing for year 2009

4. Document Number not defined

5. No amount tolerance range entered for this company

6. Entry Company code no does not exist in SKB! (G/L account company master)

7. Company coode ZR02 is not attached to field status variant