Different price in product list and product detail

Different price in product list and product detail

Since I have activated "Mindestpreis anzeigen" the shown prices in the product list (for retailer, not for customer) and in the product details are different.
This phenomen is only, when the customer is logged in as a retailer, because they have their own prices, displayed without tax.
When the function "Mindestpreis anzeigen" is set "off", anything works well.

For example, look at the screen shots below. Two screenshots for the same product, but different prices.

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Aw: Different price in product list and product detail

Productct attriutes ?
Products price Price per consignment?

Aw: Different price in product list and product detail

Don't understand?

It's only, when a "retailer" is logged in.
The product prices, shown on a listed category page is another (enduser price without tax) than on the detail page.
Then, you click on the product, and on the detail page of the product is the correct price for retailers (retailer price without tax).

Aw: Different price in product list and product detail

price for retailers (discount?)

Need more information.

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Aw: Different price in product list and product detail

Retailers have no discount, they have/they see their own price (using the addon "price for usergroup) for each product.
But I think, that it could be related with the problem of updating the addon.
Joomla comes with this error: "1060 Duplicate key name 'pgid' SQL=ALTER TABLE lc84d_jshopping_products_prices_group ADD INDEX `pgid` (`product_id` , `group_id`);
Joomla displays the addon version 2.1.0.1 and Joomshopping displays the addon version 2.1.2