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Had anyone experience that in enterprise v13  that  somehow Cost in Product Form field automatically updates negative value in it ?

We have set avg. cost method in product  category  and inventory method is perpetual "Automated".

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Decided to solve the issue temporarily with a simple module that will not allow negatives to hit the product. It also logs where the error is coming from. Goal is to be able to reproduce the error in order to open a ticket to Odoo:

https://github.com/dduarte-odoogap/price_history

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Hi

If you still facing this problem it has been solved in the 15.5+ version currently I trying to backport the Fix to version 14.0 check this pull request pull request you could check it has a detail report to the cause of the problem and the code to prevent it from happening

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Have the same situation happening in 2 different customers where Costing method= average and it happens when product is consumed in a MO or when we ship it . Both v13 and v14

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Thanks for sharing this.Yes ours is also consumption product.Please let me know if you find its cause.