Upload Error with 0Units

Hi Guys,

I have a cube which we upload data into every month. For the first time a load jas failed as in ME23 a unit has been used for the first time. This unit being 'PCE' for pieces. This did not go into BW well yesterday and I have the following error:

<b>Characteristic value PCE does not exist in the master data table of characteristic 0UNIT . Therefore, this value could not be transformed into the internal SID. </b>

How can I fix this problem? I will need step by step advice if possible.

Many Thanks

DV