@Pammie57,The plan administrator is the responsible withholding party. The IRS can recover the withholding , with interest, from the withholding party. The IRS will most likely not take any action if the tax liability is actually paid by the recipient of the distribution. If the participant does not pay the taxes owed, the IRS can recover from withholding party.
The 1099-R should reflect what actually happened. If no withholding was done, you report no withholding.