Update invoice status using API

[lpmtl]

Hi everybody,

I have to create invoices using API calls to SAP. 

There are 2 type of invoices:

• Invoices with PO reference
• Invoices with a GL / CC reference

For the invoices with a GL / CC reference, how can I POST them in SAP with a specific status (BLOCKED), then an approbation is made in an external system to approve that specific invoice. Is that a specific endpoint, or do I have to make a new POST call with a new 'SupplierInvoiceStatus' value?

For the invoice with PO references, we are currently using MRBR. 

I will POST the invoice with an API call, it will be block by MRBR (unit price difference...), how can I release that invoice if the approbation is made in an other system? Is there a specific endpoint to approve a blocked invoiced from MRBR, or do I have to update the invoice status and make a new POST with a different value of 'SupplierInvoiceStatus'?

Thanks for your help