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

To sell items not tracked in inventory, inventory items, and services, you can create two contract lines with different line types. The line type of "sell intent, free-form, project-based" allows you to sell any item or service without specifying the item number or quantity. The line type of "sell intent, item, project-based" allows you to sell inventory items by specifying the item number and quantity. Both line types are project-based, meaning they are linked to a project and generate revenue based on project performance. https://docs.oracle.com/en/cloud/saas/project-portfolio-management/20c/oapfm/manage-contracts.html#OAPFM2355835

XML (Extensible Markup Language) is the data format that is supported by SOAP (Simple Object Access Protocol) Web services to establish communication between web services consumers and web services providers. XML is a standard format that allows data to be exchanged across different platforms and applications. SOAP Web services use XML to encode the messages and data that are sent and received between the web services endpoints. https://docs.oracle.com/en/cloud/saas/project-portfolio-management/20c/oapfm/integrate-project-financial-management.html#OAPFM2356071

Ref: https://docs.oracle.com/en/cloud/saas/project-portfolio-management/19b/oapfm/project-foundation-configuration-define-types-and-categorizations.html#OAPFM222700 Topic - Manage Project Class Categories Setting Up Class Categories: Points to Consider Available as Accounting Source This option indicates if the class category is available as an accounting source so that Oracle Fusion Subledger Accounting can use the category to create mapping sets, account rules, journal line rules, and description rules.
Only one class category at a time is available as an accounting source in Oracle Fusion Subledger Accounting. To change the class category that Oracle Fusion Subledger Accounting uses, deactivate the old class category and create a new one with a different date range.

https://docs.oracle.com/applications/farel12/projectop_gs/OAPFM/OAPFM2264569.htm#OAPFM2159921 Configuring Rapid Implementation: Procedure Project application administrators can use the rapid implementation feature to set up the Project Financial Management offering. Use the Rapid Implementation for Project Financial Management Applications macro-enabled Microsoft Excel spreadsheet to enter setup data and generate the ProjectsWorkbook.zip. Upload this .zip file to the Setup and Maintenance work area. When the upload completes, the offering is configured based on the setup information that you provide.
Perform the following steps to configure rapid implementation for the Project Financial Management offering:
Prepare setup data.
Generate CSV files.
Upload setup data.
Correct errors, if any, and reload the data.