In essense this means you shouldn't really consider the word no in reply to a, or any request

if someone asks, you should be saying yes ... for appropriate requests: not involving harm or injury - emotional or physical this could have an impact on provision - financially, overcoming language barriers, supporting developmental needs, supporting famillies.
For participation & equality of access it means measures or ways to access services - transaltion, information, care assistance, care consideration, speech & language, equipment - mobility, communication, resources - for learning and play, entry to building/premises are all adapted/made fit to ensure individual inclusion - combatting any discrimination or bias. Each child should access equal service.
Affecting provision could be your lack or excess of funding - latter would be good lol. Ability to source and purchase reasonably priced or recommended/requested items. Knowing where to go to look for professional help, advice, guidance and support.
Have you applied for a grant to help a child access & participate in your setting. Sourced specialist or professional support in the setting, made contact with a support group or charity that helped insure inclusion for a child in the setting?
These articles will help:
UNCRC articles 9, 17, 23, 24, 28, 31, 37, 40
If you read from the position of being asked to provide a place in your setting for a child, would you be able to.
Hth, best wishes with finishing xx