Attribute set for BillingTypeCode while invoking REST API for associated project in projects

Summary:

We are calling the REST API in oracle fusion to create associated project under contract line using below. but it gives the error as shown below

/fscmRestApi/resources/11.13.18.05/contracts/{contractsUniqID}/child/ContractLine/{LineId}/child/AssociatedProject

Error:
Attribute set for BillingTypeCode in entity ContractRestAM.ContractAllLineEO_ContractProjectLink_ContractAllLineVOToAssociatedProjectVO_AssociatedProjectVO failed

Content (please ensure you mask any confidential information):

Version (include the version you are using, if applicable):

Oracle Fusion - 25B (11.13.25.04.0)

Code Snippet (add any code snippets that support your topic, if applicable):

request payload:

{"ProjectNumber" : "100","TaskNumber" : "T001"}