Does the maintenance claim also apply to LGBT couples?

Yes, maintenance obligations also exist between same-sex partners and therefore enforcement actions such as criminal complaints for non-attendance and the setting of a maintenance quota are also applicable. 

Note: Between partners (when there is a marriage or common-law marriage), maintenance can be requested when one of the partners does not have sufficient resources for his/her subsistence and his/her partner, having sufficient resources, does not contribute, regardless of whether they are united or in the process of separation.