This is not a decision for you and the sales force to negotiate, because there is a large diversity among potential customers and it is the single greatest responsibility of senior management to decide what market segment to invest in.
Publication of the bug list does not look like "disclosure" to the larger and more capable customers. It is a feature that expands the customer's planning, development, and decision ranges. To a smaller customer or one with a shallower requirement, it looks like an apology in advance for everything that could go wrong.
It could be that because ERP software adoption is hard to undo, your competitors are just trying to haul in market share and let the customers discover the truth when it is too late. In that case, your competitors should be forced to lose sales for their lack of transparency.
In the end, I think you can't stop publishing the list for two reasons:
First, because transparency signals the kind of bold and capable team you are, so ceasing the publication would signal that you are not that team any more.
Second, because competitors whose sales proposition is anchored on "the other guys have imperfections that we don't" will always find negatives. A bug list is a way to manage the negatives, because as the negatives evaporate, what's left is transparency.