Prior year book income was 94,000 with a retained earnings of -100. on the tax return the book income was 100,000. my retained earnings is off by 6000 ? is this due to an ajustment made to book income for tax purposes?

ON THE TAX RETURN MY CY STARTING RETAINED EARNINGS SHOULD BE 99,900 however on the books the client gave me RE is only 93900.

how do i fix this? i need to book an aje To increase income by 6000 like last year tax?