Is it permissible for an applicant for a Murabaha transaction to purchase building materials to ask suppliers (such as the electrician, the stone supplier, and the sanitary materials supplier) to include installation fees or workers' wages within the material invoices, given the financing entity's condition that invoices must not be for workers' wages?

The usurious transaction mentioned is not permissible due to the absence of the conditions for a legitimate Murabaha transaction. The most important of these is that the worker's wages are not a commodity that enters into the seller's possession. The operation must be annulled, and the principal returned to its owners without profit. The inability to pay wages does not justify engaging in usury.