When calling the standard API, it says' the sequence does not contain any matching elements'

Hello SAP,

I request to make a income bid by calling an interface from an outer system, When calling the modular API 'API_SALES_ORDER_SRV', it says' the series does not incorporate immoderate matching elements', any behaviour that calls this API volition effect successful the aforesaid error. But aft astir 30 minutes, erstwhile utilizing the aforesaid information call, determination volition beryllium nary much errors.

In addition, for a agelong clip before, the occupation occurred betwixt 4:30 p.m. and 5:00 p.m. each day, but present the occupation occurs betwixt 9:30 americium and 10:00 am.
I americium anxious to cognize however to lick oregon troubleshoot the problem. Please respond to immoderate adjuvant ideas oregon methods. Thank you precise much!

Thanks and Regards!