F-28 posts the incoming payments manually. FF68 is check deposits made in your bank will be entered manually. In F-28 you are receiving the payment from the customer and posting the payment manually.
Sometimes you will receive the checks from customers so this date you will enter in FF68 and then you execute.
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Now lot of books are available for learn SAP fico.
Buy new books about sap fico from www.flipkart.com by the link above now. (This is online shop for India alone and i will update for countries further). Sorry for the time being.
Just like to share that i have commenced www.vinoth.org (Beta), a new website for this blog. I will convert all my blog in short future.
Get ready for new website. Just give your email id in this blog to know about the new website with new features.