East African Community Court of Justice Rules of Procedure, 2019. before signing the certificate of taxation is excessive, he or she may make such a deduction from the total as will in his/her opinion render the sum reasonable. 13. If more than one quarter of the profit costs claimed is disallowed on taxation the costs of drawing, filing and serving the bill and attending taxation may be disallowed. 14. Where a party entitled to receive costs is also liable to pay costs, the taxing officer may tax the costs which that party is liable to pay and adjust them by way of deduction or set-off and direct payment of any balances. 15. (1) Costs of more than one advocate shall not be allowed unless the Court has so directed— provided that if an advocate has instructed another advocate to appear at the hearing of a matter, the fee paid to the latter, or so much thereof as the taxing officer considers reasonable, may be allowed so long as the total of such fee and the instruction fee allowed in instructing the advocate shall not be greater than it would have been if one advocate only had acted in the matter. (2) Where the Court has directed that the costs of two advocates be allowed:— (a) where the senior advocate is not a member of the same firm as the advocate on the record, he shall be allowed the fee paid to him, including fees for attending in Court, or so much thereof as the taxing officer shall consider reasonable; (b) where the senior advocate is a member of the same firm as the advocate on record, he shall be allowed such fee as would have been allowed in the case of the advocate not a member of that firm; and (c) the advocate on record shall be allowed the usual instruction, hearing and other fees. 94