Validate WrkCtrId AX 2012/D365

Below are some example to understand Relations between Route, Resource and Resource group tables in AX 2012/D365

if(routeWrkCtrId != "" &&  routeWrkCtrId != _wrkCtrIdToValidate)
    {
        select firstOnly wrkCtrResourceGroupResourceRoute
            where wrkCtrResourceGroupResourceRoute.WrkCtrId == routeWrkCtrId;

        select firstOnly wrkCtrResourceGroupResource
            where wrkCtrResourceGroupResource.WrkCtrId == _wrkCtrIdToValidate;

        if(wrkCtrResourceGroupResource.ResourceGroup != wrkCtrResourceGroupResourceRoute.ResourceGroup)
        {
            throw error(strFmt('@TTT214',WrkCtrResourceGroup::find(wrkCtrResourceGroupResourceRoute.ResourceGroup).WrkCtrId));
        }
    }
    //If resource group is attached to selected opration, validate that selected resource should fall under that resource group.
    else if(prodRoute.activityRequirementSet().resourceGroupRequirement().RecId)
    {
        //retrive operation resource group.
        routeWrkCtrId = prodRoute.activityRequirementSet().resourceGroupRequirement().WrkCtrId;

        select firstOnly wrkCtrResourceGroupResource
                where wrkCtrResourceGroupResource.WrkCtrId == _wrkCtrIdToValidate;

        if(prodRoute.activityRequirementSet().resourceGroupRequirement().RecId != wrkCtrResourceGroupResource.ResourceGroup)
        {
            throw error(strFmt('@TTT214',routeWrkCtrId));
        }
    }
    else
    {
        throw error('@TTT216');
    }