validatePerRegion = (child) => {
  const validationResult = [];

  // PerItem and PerRegion are incompatible but PerRegion is more prioritized mode
  if (child.perregion && child.peritem) {
    validationResult.push(
      errorBuilder.generalError(
        "Attribute <b>perItem</b> is incompatible with attribute <b>perRegion</b>. " +
          "They define two different modes. However <b>perRegion</b> works fine even with multi-item mode of object tags.",
      ),
    );
  }

  return validationResult;
}
Validate perRegion restrictions
@param {Object} child