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If the LineNumber is sent then it will Split the Service Line Item matching the given Line Number, otherwise it will Add and/or Remove Related Line Items based on the Action against each of the Asset Line Items IDs.
All standard and custom fields on the Related Line Item object are supported here provided they are editable.
curl --request POST \--url https://cpq--winter21.my.salesforce.com/Apttus_CPQApi/RelatedLineItems/v1/ \--header 'Accept: application/json' \--header 'Content-Type: application/json' \--data '{"RelatedLineItems": [{"RelatedLineItemSO": {"Id": "a5r2i000000D86Y","Apttus_Config2__WeightageType__c": "Amount","Apttus_Config2__WeightageAmount__c": 35}},{"RelatedLineItemSO": {"Id": "a5r2i000000D86Z","Apttus_Config2__WeightageType__c": "Amount","Apttus_Config2__WeightageAmount__c": 35}}],"CartId": "a1I2i000000mJ7T"}'
1{2"IsSuccess": "TRUE",3"Errors": null4}