src/CoreBundle/EventListener/DcGeneral/MetaModel/PasteButtonListener.php
private function checkForModel($containedModel, $action)
    {
        if (!$this->circularReference) {
            if ($this->hasVariants()) {
                $this->checkModelWithVariants($containedModel);
            }
            $this->checkModelWithoutVariants($containedModel);
        } elseif ($this->currentModel == null && $containedModel->getProperty('varbase') == 0) {
            $this->disablePA = true;
        } else {
            $this->disablePA = false;
            // The following rules apply:
            // 1. Variant bases must not get pasted into anything.
            // 2. If we are not in create mode, disable the paste into for the item itself.
            $this->disablePI =
                ($this->hasVariants() && $containedModel->getProperty('varbase') == 1)
                || ($action != 'create' && $containedModel->getId() == $this->currentModel->getId());
        }
    }
private function checkForModel($containedModel, $action)
    {
        if (!$this->circularReference) {
            if ($this->hasVariants()) {
                $this->checkModelWithVariants($containedModel);
            }
            $this->checkModelWithoutVariants($containedModel);
        } elseif ($this->currentModel == null && $containedModel->getProperty('varbase') == 0) {
            $this->disablePA = true;
        } else {
            $this->disablePA = false;
            // The following rules apply:
            // 1. Variant bases must not get pasted into anything.
            // 2. If we are not in create mode, disable the paste into for the item itself.
            $this->disablePI =
                ($this->hasVariants() && $containedModel->getProperty('varbase') == 1)
                || ($action != 'create' && $containedModel->getId() == $this->currentModel->getId());
        }
    }
Check the PA and PI with a model.

@param ModelInterface $containedModel The model with all data.

@param string         $action         The action to be checked.

@return void