Service customer price not used even if PRODUIT_CUSTOMER_PRICES enabled

[DR59]

Bug

We are trying to bill customers for time spent on projects but only default price for services is used for invoice computing, not customer specific price.
NOTE : We use delcroip Project TimeSheet module (https://github.com/delcroip/dolibarr_project_timesheet) and not the standard basic time sheet functions.

Environment

• Version: 11.0.1
• OS: Debian 9
• Web server: Apache/2.4.38
• PHP: 7.3.19
• Database: MariaDB 10.3.25
• URL(s): compta/facture/card.php?facid=###

Expected and actual behavior

We expected that the invoice would use the customer specific price to compute the price for the service billed (provided that the work has been done after the date of validity for the given price).

Actual behavior is that when we generate the bill, the values used are all default prices and not the values contained in the product_customer_price table. The prices used for the invoice, as displayed by page compta/facture/card.php?facid=###, is just the default ones and the generated PDF also use those default values.

Steps to reproduce the behavior

Activate per customer price in PM/Services modules
Create a service and activate it for selling, entering a default price and then adding a different selling price for a given customer.
Create a project the the given customer with a billable task using the defined service. Enter some time for this task at a date posterior to the customer specific price validity date for the related service.
Bill the project. When bill displayed (compta/facture/card.php?facid=#) only default prices are used.