Descriptive Flexfield - attribute6 is missing

Summary:

I'm configuring DFF's on Project Expenditure Item. These are Context Sensitive Segments. This is how it looks now:

Manage Contexts:

I then press + on Context Sensitive Segments

Where is attribute6????

I did configure the attribute6 previously, but it did not appear in the Segments area, so I deleted all and restarted. But now Attribute6 is missing!

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