Hi, I have quickly checked with GeneSCF and term you specified is present in 'jcvi' (below is the result for the term). I guess (not completely sure) it is the problem with processing the annotation by GOstats (it looks like GO stats is trying to convert your gene names to entrez ids (or just number representation) and mapping to the annotation which doesn't have support for entrezid). That is the reason there are no genes in annotation.
GO:0008483 result from GO molecular function using GeneSCF prepare_database:
GO:0008483~transaminase activity BA_1341,BA_2294,BA_2737,BA_2899,BA_3062,BA_3312,BA_3886,BA_4225,BA_4254,BA_4626,BA_4663,BA_4900,BA_5133,BA_5138,CHY_0011,CHY_1173,CHY_1436,CJE_0146,CJE_0882,CJE_1486,CJE_1514,CPF_0060,CPF_0325,CPF_0356,CPF_0707,CPF_0845,CPF_0911,CPF_1258,CPF_1623,CPF_1667,CPF_1720,CPF_2163,CPF_2212,CPS_0838,CPS_2054,CPS_2190,CPS_3232,CPS_3390,CPS_4612,CPS_4663,CPS_4878,DET_0576,DET_0739,GSU_0018,GSU_0084,GSU_0117,GSU_0162,GSU_1868,HNE_0095,HNE_0652,HNE_0889,HNE_1171,HNE_2243,HNE_2311,HNE_2357,HNE_2367,HNE_2507,HNE_2588,HNE_2594,LMOf2365_0306,LMOf2365_1615,LMOf2365_2132,LMOf2365_2341,MCA_0399,MCA_0598,MCA_1021,MCA_1491,MCA_2053,MCA_2125,MCA_2288,MCA_2997,PFL_0306,PFL_0754,PFL_1309,PFL_1609,PFL_1655,PFL_1824,PFL_1867,PFL_2045,PFL_2138,PFL_2406,PFL_2461,PFL_2868,PFL_3043,PFL_3219,PFL_3222,PFL_3354,PFL_3470,PFL_3521,PFL_4112,PFL_4152,PFL_4247,PFL_4362,PFL_4578,PFL_4657,PFL_4884,PFL_4949,PFL_5269,PFL_5681,PFL_5927,PFL_5960,PFL_6043,PSPTO_0096,PSPTO_1072,PSPTO_1440,PSPTO_1531,PSPTO_1779,PSPTO_1920,PSPTO_2136,PSPTO_5395,PSPPH_0218,PSPPH_0459,PSPPH_0862,PSPPH_1325,PSPPH_1931,PSPPH_2983,PSPPH_3631,PSPPH_4896,PSPPH_5053,SO_2483,SO_3497,SO_3789,SO_4343,SPO_0388,SPO_1136,SPO_1166,SPO_1295,SPO_1370,SPO_1401,SPO_1468,SPO_1567,SPO_1697,SPO_1916,SPO_2005,SPO_2024,SPO_2144,SPO_2589,SPO_2795,SPO_3027,SPO_3220,SPO_3230,SPO_3417,SPO_3471,SPO_A0113,SPO_A0352,SPO_A0354,VC_0392,VC_0748,VC_1184,VC_1625,VC_2309,VC_A0513,VC_A0523,VC_A0605,VC_A0824