Question: 

Trying to save custom options template generates a Unique Constraint Violation - https://prnt.sc/n3zzxr 


[2019-07-04 10:40:41] main.CRITICAL: Exception message: Unique constraint violation found

Trace: #0 /home/r/i/rit0009vps/public_html/vendor/magento/framework/EntityManager/EntityManager.php(96): Magento\Framework\EntityManager\Operation\Update->execute(Object(Magento\Catalog\Model\Product\Interceptor), Array)

#1 /home/r/i/rit0009vps/public_html/vendor/magento/module-catalog/Model/ResourceModel/Product.php(655): 

[...]

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Answer:

edit file
 /home/mdv2diamondgolf/public_html/app/code/Bss/MultiStoreViewPricingTierPrice/Model/Product/Attribute/Tierprice.php
if ($this->helper->isAdmin() && $this->helper->checkRoute() == 'catalog_product') {
to
if (($this->helper->isAdmin() && $this->helper->checkRoute() == 'catalog_product') || $this->helper->checkRoute() == 'bsscustomoption_template') {