On synching my iphone for purchases it says my computer is not authorised, it is what do I do

On my recent synching with my iphone 4 when itunes reaches step 3 to transfer purchases, in this case ibooks, it states authorise this computer.  I enter email address and password then receive a reply this computer is authorised I click ok immediately this computer is not authorised appears.  I then have to cancel the request to authorise the computer which cancels the synching. It now means I can no longer access my ibooks from my iphone.  Can anyone offer a suggestion please.

The following document might be worth a try:
iTunes repeatedly prompts to authorize computer to play iTunes Store purchases

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