inventorySetQuantities updates quantites after some time

[mdou]

Hi all,

Hope someone has experienced this behaviour before or maybe I am doing something wrong when setting inventory quantites to Shopify.

Our ERP system updates stock into Shopify using a GraphQL API (2024-07) call with query "inventorySetQuantities":

mutation inventorySetQuantities($input: InventorySetQuantitiesInput!) {
  inventorySetQuantities(input: $input) {
    inventoryAdjustmentGroup {
      createdAt
    }
    userErrors {
      field
      message
    }
  }
}

 We are facing a strange behaviour in "Adjustment history" in Shopify admin website. In the query "inventorySetQuantities" we ask for "creationAt" (inventoryAdjustmentGroup) field.
Sometimes we get a datetime in "createdAt" field (the following image is the response we receive:

And the adjustment is properly created in "Adjustment history" section:

But sometimes in the response we get a "nul":

and the adjustment is created after some hours (GraphQL API request is made on 05/02/2025 2:12 am)

Has Shopify some kind of buffer and process requests after some time?