You have projects and tasks defined with transaction controls, which does not allow certain types...

Ref:https://docs.oracle.com/en/cloud/saas/project-portfolio-management/18c/oapfm/project-costing-configuration-define-project-costing-integrations.html#OAPFM174886

How can I validate distribution sets for projects information?

Oracle Fusion Projects performs validations on Oracle Fusion Payables distribution sets for payables invoices at the time you create the actual distribution set lines. It validates the project and task number during the invoice validation.

Distribution sets are typically used on recurring transactions, and the associated project does not have transaction controls.When you create a distribution set in Oracle Fusion Payables, the distribution set line is not validated against the project transaction controls in Oracle Fusion Projects because you do not enter anexpenditure item date, which is required for transaction control validation.The expenditure item date is not provided because you use the distribution sets for an indefinite period of time.