1. The correct syntax requires a * at the beginning of the path:
'#Uses "*enterprise://ABCD/product_A/Enterprise Documents/ControlChart.svx"
Or
2.1 when you type '#Uses, the autocomplete UI will come up;
2.2 press tab or enter, you will be prompted to browse the local file system or Enterprise;
2.3 Make a selection and choose a file, the reference will be added automatically.