3703619 - Purchase Contract Net Order Price is 0.00 when future date

When posting a new contract using the Odata API_PURCHASECONTRACT_PROCESS_SRV the net price is 0.00  even although the net price is passed in the payload. 

SAP S/4Hana Public Cloud Edition 

Run the API to post a new contract (Sample payload attached) 

Standard system behaviour 
When a contract is created via the API the system takes the contract start date as the start of the validity period for the contract conditions.
So if you set it in the future the net price is determined as 0.00 because there is no valid condition price for the current date.
The result would be the same if you manually set the condition validity date to be in the future in the create purchase contract (ME31k)   

Set a contract start date in the payload with the current date or a date in the past. 

CL_API_MASTER_CONDITION_MM, MM06EFSK_KONT_KOND_PREIS_UEBER, MM06EFSK_KONT_WERTE_ERMITTELN, ls_konh-datab, CL_API_MASTER_COND_MM_FIORI   , KBA , MM-FIO-PUR-SQ-CON-CL , Fiori UI for Manage Purchase Contracts (Public Cloud) , How To