In Lightning Experience, the Sales Price doesn't carry over from the Product List Price during the 'Add Product' action like it does in Classic Experience. Lightning Experience merges a product’s standard and custom price book entries into a single Price Books related list. This is different from Salesforce Classic, which has separate related lists for Standard Prices and Price Books which allows for carrying over the Product List Price during the Add Product Action.
For Example: A sales rep adds products to an Opportunity in Lightning and notices the Sales Price field is blank even though a List Price is set.
In certain cases, adding the List Price in the Price Book Entry 'Search Layout' for the affected users' Profile will resolve this issue.
Note: This is a potential workaround and may not work for every use case.
To confirm that 'List Price' is included in the Price Book Entry:
See Also:
Enable Users to edit the Opportunity Product Sales Price
Sales Features: What’s Different or Not in Lightning Experience
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