What is the mixed contract?
Ok, I release it in Cristiano: a mixed contract, when we talk about public tenders and moves from the public sector, it is basically a legal Frankenstein. That is, you grab two or more types of different contracts, mixtures in one, and zas! You have a mixed contract. This happens when a single tender asks you, for example, to build something and at the same time provide all the material or services to work. Everything together, all scrambled.
For example, imagine that they ask you to raise a building (that would be the typical work contract) and you have to put all the equipment (supply contract). Two different things, but put them in the same package. It is like asking you to cook and then Friegue the dishes, all included in the same treatment.
At the keyword level for SEO, you do not break your head: "mixed contract", "public tenders", "contracting of the public sector", "works contract", "supply contract", "service contract". The typical thing someone lost on these issues would seek.
Legally, the roll gets more interesting. The rules are not equal everywhere. In the European Union, for example, the 2014/24/24/EU directive says that if the contract seems to be of several types at the same time, you have to look at the main component and govern that. Come on, what else, sends.
Now, a friend's advice: if you are a company and launch yourself for a mixed contract, eye. Each type of contract within the "mix" has its rules, its paperwork, its headaches. Before signing anything, find out what each part is going and what they are asking for exactly. Do not get carried away by the emotion of winning the tender.
And don't forget, these contracts are a mess. More complicated to handle than lifelong contracts, because you have to deal with several things at the same time, each with their stories. So you have to put more people to manage the matter or look for someone who knows how to move in this field. It is not for amateurs, I tell you now.
In summary: the mixed contract is a useful tool, yes, because it gives you a room for maneuver and you can do several things in a single play. But it can also be a mines field if you don't know where you get. So, if you go and you have the team for it, go ahead. If not, better think twice.