It depends what kind of rozporzadzenie:
in law (like a journal of decrees) - you would generally use decree or ordinance
if this pertains to a corporation - disposition would be much better.
If you want you can send me the whole sentence.

Astro,

The Collins Dictionary gives the following explanations:

DECREE = an edict, law, etc., made by someone in authority

ORDINANCE = an authoritative regulation, decree, law, or practice

RULE = an authoritative regulation or direction concerning method or procedure, as for a court of law, legislative body, game, or other human institution or activity

ORDER = an instruction that must be obeyed; command

DIRECTIVE = an instruction; order

DISPOSITION = a person's usual temperament or frame of mind

DISPOSITION IS THE ONLY WORD THAT IS TOTALLY WRONG IN THIS CONTEXT. I also consulted native English speakers and they confirm that it is used to say that someone is for example in a bad disposition.

Basically, I would hesitate between DECREE, ORDINANCE and DIRECTIVE, but since it is an internal company thing, I would opt for DIRECTIVE.

absolutely not a decree or ordinance in this context.
Disposition - checked with my native American husband (owns his own business) and two other native American (one lawyer, one a sales representative) - three of them agree on either disposition or directive.
Some things you just can't get straight from dictionary.
From my previous 8 year experience working for a computer company we were either receiving dispositions or directives.

It depends in which context you're going to use it...
company policy - you don't find it in a dictionary, but each company in USA has an employee hanbook which describes company policy regaring all aspects of work, compensation, holidays, drugs, etc.

directive - it's more like an order, ordering something to be done

The answer clearly depends on where you are located and which variety of English you opt for.