We had accepted a foreign check ( normally sent through Collections) at our teller line, went through proof and had our
Bank's endorsement on back. Now we would like to send for collection, but the Bank where we send items for collections will not accept due to our mistake of having our endoresment on the Bank. Any ideas as to how to send this check for collection ( ie due we cross through the endorsement and send?) This is not my area of expertise. That is my disclaimer.

You can't force a bank to accept a collection item from you. If you don't have the ability to send the item directly yourself, you will be returning the check to your customer and asking them to get a replacement.

Thanks for your response.