Inverted Index

[DarkvoiceGit]

Hi,
I'm new to electroDB and wanted to add an GSI which has the PK and SK Inverted for my access patterns
I get The Sort Key (sk) on Access Pattern 'bySK' refrences the field 'SK' which is already referenced by the Access Pattern 'byItemId' as a Partitiion Key

it looks like this

indexes:{
    byItemId:{
        collection: itemCollection,
        type: 'clustered',
        pk: {
            field: 'PK',
            composite:['itemId']
        },
        sk: {
            field: 'SK',
            composite: []
       }
    },
    bySk:{
        index: 'GsiInvertedPk',
        pk:{
            field: 'SK',
            composite:[]
        },
        sk:{
            field: 'PK',
            composite:['itemId']
        }
    }
}

const itemsEntity = getItemEntity()
await itemsEntity.query.bySk({PK: 'item_1'})

Do I really have to create new fields and fill them with the PK and SK values ?