fixup! erp5_trade: enable template creation for purchase order

also needs to be declared in hidden content types to prevent adding
directly in preferences
18 jobs for arnau in 0 seconds
Status Job ID Name Coverage
  External
passed ERP5.CodingStyleTest-TestRunner2

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failed ERP5.CodingStyleTest-TestRunner2

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failed ERP5.CodingStyleTest-TestRunner2

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failed ERP5.CodingStyleTest-TestRunner2

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failed ERP5.CodingStyleTest-TestRunner2

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failed ERP5.CodingStyleTest-TestRunner2

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failed ERP5.CodingStyleTest-TestRunner2

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failed ERP5.CodingStyleTest-TestRunner2

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failed ERP5.CodingStyleTest-TestRunner2

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failed ERP5.CodingStyleTest-TestRunner2

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failed ERP5.CodingStyleTest-TestRunner2

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failed ERP5.CodingStyleTest-TestRunner2

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failed ERP5.CodingStyleTest-TestRunner2

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failed ERP5.CodingStyleTest-TestRunner2

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failed ERP5.CodingStyleTest-TestRunner2

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failed ERP5.CodingStyleTest-TestRunner2

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failed ERP5.CodingStyleTest-TestRunner2

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failed ERP5.CodingStyleTest-TestRunner2

00:00:10