"Price List Not Selected" message

1

I cant make a quotation in an opportunity for an open lead

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and i have a selling price list for this item

2

Set a default price list in Selling Settings page.

3

Look what problem now i have

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4

This seems to be working fine in the test account.
Which version you are on?

5

Looks like you have created a custom field for Company in any of the sales transactions which are Quotation, Sales order, Delivery Note and Sales Invoice. If yes, please delete that custom field, it is creating conflict with standard company field.