API error - expected type Edm.Guid

I am working through a program Celigo to build an integration into Business Central. As the program attempts to write sales order lines, I am given the below error:

"{\"error\":{\"code\":\"BadRequest\",\"message\":\"Cannot convert the literal '' to the expected type 'Edm.Guid'. CorrelationId: 6ea9180f-47d4-4e6b-8d76-2c2e0998875a.\"}}"

Has anyone seen this type of error, know what it is referring to, or have any recomendations?

Thanks,

Kevin

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