Freight costs not reversed after GR cancellation.

Good Day

• I created a PO and added a freight condition type FRB1 for an amount of R150.

• A GR was done on the PO and the following postings occurred- Inventory account 12,260.00

                                                                                                               GR/IR recon. 12,110.00-

                                                                                                                Freight Clearing 150,00-

• When the GR was reversed( MGO- Movement type 102)  the following postings occurred.The freight clearing account is not cleared and on the po history, for the cancellation, the DCGR value is 0.

                        Inventory account 12,110.00-

                        GR/IR recon.         12,110.00

Why is the R150 not cleared after the reversal of GR? Please help.