Thanks Vaidhy,
I used the same SP and found the applied cash receipt details. Also, I confirmed that cash receipt is not posted properly, because it staying in the table without required fields in GP. Also, the GL is not created for that cash receipt. So, I confirmed that cash receipt is not valid. Now, I have make that invoice as not applied to allow apply with other cash receipt. As per your suggestion, I will remove the applied document number from RM20201 table and and CURTRXAM to zero. are this two steps enough for making that invoice as open?