"sulatan" is directional/locative focus (the focus is either the person receiving the writing/text, or the location or thing the text is being written on). If you want to focus on the thing being written or writing on behalf of someone, use "isulat" instead.
The Tagalog.com Dictionary is now an App!
Sulatan Example Sentences in Tagalog: (6)
Example sentences created by professional Filipino teachers and writers.