@PRABA7385
The most likely cause of this is that your SIM 1 field is a numeric type in SharePoint, and the value that you're trying to enter exceeds the maximum numeric value of 9007199254740991 in Power Apps.
The fix would be to change this to a text field.
Here's a link to the documentation.
https://docs.microsoft.com/en-gb/power-apps/maker/canvas-apps/functions/data-types
>> Canvas apps can exactly represent whole numbers (or integers) between –9,007,199,254,740,991 (–(253 – 1)) and 9,007,199,254,740,991 (253 – 1), inclusive. This range is larger than the 32-bit (or 4-byte) integer data types that databases commonly use. However, canvas apps can't represent 64-bit (or 8-byte) integer data types. You might want to store the number in a text field or use a calculated column to make a copy of the number in a text field, so that it's mapped into a Text data type in the canvas app. In this manner, you can hold, display, and enter these values, as well as comparing them to determine whether they're equal; however, you can't perform numerical calculations on them in this