Reference https://docs.oracle.com/cloud/latest/projectcs_gs/FAPFM/FAPFM1192914.htm Topic - Creating Calendars for Projects and Resources: Procedure Project Schedules are used as a base for project and resource calendars in Project Execution Management applications. The smallest scheduling unit is a day. For example, you can define the number of hours in a day but, you can,t schedule work for a specific time of the day.
The following are the elements of a schedule:
Shifts
Workday patterns
Exceptions

Ref: https://docs.oracle.com/en/cloud/saas/project-portfolio-management/19b/oefpp/overview.html#External_Data_Integration_Services_for_Oracle_Cloud_Overview

When a project invoice is transferred or created in Receivables, the project sends only the invoice header and invoice line description to Receivables, not the invoice distributions. The invoice distributions contain the detailed information such as quantity, unit price, and line total. Therefore, the Receivables invoice does not show these details, but only shows a quantity of 1 and a unit price equal to the line total. https://docs.oracle.com/en/cloud/saas/project-portfolio-management/20c/oapfm/manage-project-invoices.html#OAPFM2355931

The section on the Manage Project Transaction Sources page that will allow you to enable these options is Document Entries. This section allows you to define the attributes and options for each document entry type that is associated with a transaction source. A document entry type represents a group of transactions that have similar characteristics and processing rules. For example, you can define a document entry type for expense reports and enable adjustment and reversal options for this document entry type. The Documents section allows you to define the attributes and options for each document type that is associated with a transaction source. A document type represents a source document that contains one or more transactions. For example, you can define a document type for expense reports and enable validation and transfer options for this document type. The Transaction Source section allows you to define the attributes and options for each transaction source that is used to import transactions from an external system. A transaction source represents a system or application that provides transactions to Oracle Fusion Project Costing. For example, you can define a transaction source for expense reports and enable costing and accounting options for this transaction source. The Transaction Entries section allows you to review and manage the transactions that are imported from an external system using a transaction source. You can view, edit, adjust, reverse, validate, and transfer transactions in this section. https://docs.oracle.com/en/cloud/saas/project-portfolio-management/20c/oapfm/manage-project-costs.html#OAPFM2356241