Hi @JLKM,
The 0x80040203 is a pretty generic error code, I believe it refers to invalid argument. Based on the message I would suggest to double check the QueryExpression - 1 field value.
In the examples I have seen that SubQueryExpression property was never used. Have you also tried it without that property, like below:
{
"EntityName": "new_mycustomentity",
"Criteria": {
"FilterOperator": "And",
"Conditions": [
{
"AttributeName": "_createdby_value",
"Operator": "Equal",
"Values": [
{
"Value": "",
"Type": "System.String"
}
]
},
{
"AttributeName": "importsequencenumber",
"Operator": "LessThan",
"Values": [
{
"Value": "",
"Type": "System.Int32"
}
]
}
]
}
}
