Marrying indonesian women and documents

Hello All, My name is Sami and I am a Indian Muslim.I have two queries related to my marriage. 1. I want to marry to a Indonesian woman whom I love. When I was going through the checklist of documents that needed found that "Letter from both sets of parents/guardians, stating that there are no objections to the marriage.". I can provide the bachelor hood certificate but may I know why you need the letter from both parents. As per the Indian law I can marry to anyone if I am over 21. I am 30 now and I see there is no provision attested in law that my parents approval is needed for marriage they why are the asking for such thing. Because my mom didn't agree for my marriage but her parents already agreed for our marriage. So please let me know is providing single status certificate is enough. If there is any provision in Indonesian law asking for the parents agreement please let me know the details. 2. I don't have birth certificate instead I can provide any document like (aadhar card, Income Tax card or Voter ID card, passport..etc) which shows my birth date as my identity so will it be sufficient or do I have to get notary attestation? I am looking forward to hear from you.