Consuming requirements

If I have a conandata.yml with requirements which have this structure:
```
requirements:
- 'name/version@user/channel'
- 'name/version@user/channel'
- 'name/version@user/channel'
```
And in conan recipe(conanfile.py) I have requirements method which looks like that:

```
def requirements(self):
for req in self.conan_data['requirements']:
self.requires(req)

```
The question is how can I import more than one requirements? When I tried to use this syntax in my code, I get this error:

Error in build_requirements() method, line 35
self.requires(req)
ConanException: Duplicated requirement: name/version@user/channel

How can I use all the requirements for my creating conan packages?

Thank you!