Invalid object type with line items api

I keep getting this error and it feels, well, cryptic. Does anyone have any explanations for this?

{
	"status": "error",
	"message": "invalid from object type 0-8 for associations to be created. expected: 0-3",
	"correlationId": "e1066c02-e76c-4e19-89c8-15aa2af2a1bc",
	"category": "VALIDATION_ERROR"
}

Hey, @VernBriggs :waving_hand: Can you share an example request? It helps to give the community context.

Best,

Jaycee