There are some POIs that have the same Wikidata code, but this can't happen.
Here a list of all the POI IDs with this problem:
```
SELECT wikidata_code, GROUP_CONCAT(poi_ID) FROM poi WHERE wikidata_code <> '' GROUP BY wikidata_code HAVING COUNT(*) > 1 ORDER BY COUNT(*) DESC;
```
| wikidata_code | GROUP_CONCAT(poi_ID) |
| Q1145261 | 16605,15656 |
| Q17798 | 14315,14651 |
| Q1787397 | 14600,7288 |
| Q178813 | 13469,11651 |
| Q18040 | 14286,14659 |
| Q18356 | 14264,14637637,14264 |
| Q18365 | 14267,14644 |
| Q18368 | 14643,14268268,14643 |
| Q18416884 | 10661,10770770,10661 |
| Q18755063 | 8108,79447944,8108 |
| Q1903 | 12755,16045 |
| Q1916826 | 15043,16018 |
| Q19840 | 16180,72717271,16180 |
| Q19846 | 7273,16300 |
| Q20099 | 14341,14638638,14341 |
| Q20109 | 14344,14649 |
| Q20191 | 14650,14367 |
| Q20251 | 14383,14648 |
| Q2034331 | 15070,15268 |
| Q2047639 | 8348,8439 |
| Q20478 | 14890,14372 |
| Q20494 | 15028,148964896,15028 |
| Q2077168 | 11427,11282282,11427 |
| Q21013539 | 1657953,1655379 |
| Q21192547 | 144859,144895 |
| Q21192550 | 9563,109410943,9563 |
| Q21552096 | 92665,92656 |
| Q21552273 | 9280,920404,9280 |
| Q224172 | 14350,14902 |
| Q232912536 | 14393,14680 |
| Q23285 | 14697,8,14287 |
| Q23291 | 14288,14697 |
| Q2506967 | 11857,10965 |
| Q254139 | 14455,14561561,14455 |
| Q266604 | 14544,14463 |
| Q266794 | 14554,14457457,14554 |
| Q266941 | 1446550,1455460 |
| Q266975 | 14547,14449449,14547 |
| Q268067 | 14470,14257 |
| Q268995 | 14320,14471 |
| Q269516 | 14404,14474 |
| Q269823 | 1448245,1444582 |
| Q270032 | 14466,14560 |
| Q270189 | 14571,14456456,14571 |
| Q270320 | 14979,14556 |
| Q270328 | 15015,145644564,15015 |
| Q270492 | 14441,14526526,14441 |
| Q270548 | 14512,150145014,14512 |
| Q270613 | 14462,14527 |
| Q270782 | 14454,14506 |
| Q271152 | 14511,14451 |
| Q271236 | 14517,14446 |
| Q271358 | 14444,14528 |
| Q28001134 | 7041,7065 967848 |
| Q2967848 | 9398,7825| 7825,9398 |
| Q2968191 | 8829,14751 |
| Q30031546 | 14677,14978 |
| Q30159213 | 12387,12642 |
| Q3328396 | 9366,15991 |
| Q3361323 | 10637,10944 |
| Q3364763 | 13187,13299299,13187 |
| Q34805 | 14708,14994 |
| Q35082 | 14340,14754754,14340 |
| Q35226 | 14718,14226226,14718 |
| Q358729 | 14696,13328 |
| Q3649109 | 10617,8766 |
| Q3657503 | 15804,164288766,10617 |
| Q3662426 | 1160052,1001652 |
| Q3662456 | 9648,961010,9648 |
| Q3718646 | 15404,89128912,15404 |
| Q3757770 | 15285,90669066,15285 |
| Q3763803 | 9232,9230 |
| Q376739 | 8897,90809080,8897 |
| Q3785099 | 14073,14180180,14073 |
| Q3867520 | 9025,898925,9025 |
| Q3867716 | 9135,16096 |
| Q3867764 | 8047,800909,8047 |
| Q3867831 | 91732,91723 |
| Q3867851 | 82632,82623 |
| Q3867963 | 8790,90379037,8790 |
| Q3867973 | 9024,9005 |
| Q3868051 | 8677,9075 |
| Q3868253 | 88856,88865 |
| Q3868400 | 79943,79934 |
| Q3868487 | 9022,9151 |
| Q3886621 | 15832,16466 |
| Q3886642 | 15944,16441 |
| Q3889575 | 15277,16554 |
| Q3889659 | 10800,10632632,10800 |
| Q3890190 | 15254,15264 |
| Q3890261 | 152876,152867 |
| Q3890698 | 13602,13612 |
| Q3892388 | 14518,14686 |
| Q389563421 | 13206,145913,12330 |
| Q389564631 | 13216,161774591,13206 |
| Q38956476 | 146666177,132176 |
| Q3895726647 | 13180,14083217,14666 |
| Q3934723895726 | 11336,113454083,13180 |
| Q3936898 | 10762,10555555,10762 |
| Q3951389 | 10456,10245 |
| Q4011905 | 6985,6977 245,10456 |
| Q47467390 | 15045,13962 |
| Q50119 | 15132,15133 |
| Q54087650 | 8914,8525525,8914 |
| Q54874186 | 9058,9059 |
| Q55354223 | 80034,8004 |
| Q55354232 | 10057,79723 |
| Q55370383 | 8884,1616116161,8884 |
| Q55372377 | 14812,89448944,14812 |
| Q55375790 | 8823,884040,8823 |
| Q55379362 | 8237,8238 |
| Q55391578 | 9733,9732 |
| Q55686292 | 11359,11360 |
| Q55832719 | 11241,108420842,11241 |
| Q574879 | 13490,13491 |
| Q58844 | 13273,14184 |
| Q606494 | 7891,785656,7891 |
| Q635414 | 14116,133243324,14116 |
| Q867361 | 7208,13318 |