Hello Formiga,
If you look in Sub-Saharan Africa you can see a theme 'Carnet Ghana' by Ronnie 79 - if you then go to his blog he did not have a carnet and crossed from Burkina to Ghana two weeks ago and is at present at Axim on coast.
It seems that, although most Francophone countries in WA officially allow a laisser Passer, Ghana, being Anglophone, does not (at least officially). From replies on Ronnie's thread it seems you may be lucky at main crossing at Po, if you slip something to Ghanaian police!
Good Luck!
Peter
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